45454545 has 48 divisors (see below), whose sum is σ = 81246672. Its totient is φ = 23500800.

The previous prime is 45454543. The next prime is 45454547. The reversal of 45454545 is 54545454.

45454545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

45454545 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (45454543) and next prime (45454547).

It can be written as a sum of positive squares in 8 ways, for example, as 3968064 + 41486481 = 1992^2 + 6441^2 .

It is not a de Polignac number, because 45454545 - 2¹ = 45454543 is a prime.

It is a super-2 number, since 2×45454545² = 4132231322314050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

45454545 is an undulating number in base 10.

45454545 is a modest number, since divided by 454545 gives 45 as remainder.

It is not an unprimeable number, because it can be changed into a prime (45454543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331717 + ... + 331853.

It is an arithmetic number, because the mean of its divisors is an integer number (1692639).

Almost surely, 2^45454545 is an apocalyptic number.

45454545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

45454545 is a deficient number, since it is larger than the sum of its proper divisors (35792127).

45454545 is a wasteful number, since it uses less digits than its factorization.

45454545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 319 counting only the distinct ones).

The product of its digits is 160000, while the sum is 36.

The square root of 45454545 is about 6741.9985909224. The cubic root of 45454545 is about 356.8829265622.

Adding to 45454545 its reverse (54545454), we get a palindrome (99999999).

Subtracting 45454545 from its reverse (54545454), we obtain a palindrome (9090909).

The spelling of 45454545 in words is "forty-five million, four hundred fifty-four thousand, five hundred forty-five".