45009805 has 4 divisors (see below), whose sum is σ = 54011772. Its totient is φ = 36007840.

The previous prime is 45009793. The next prime is 45009817. The reversal of 45009805 is 50890054.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50890054 = 2 ⋅25445027.

It is an interprime number because it is at equal distance from previous prime (45009793) and next prime (45009817).

It can be written as a sum of positive squares in 2 ways, for example, as 31606884 + 13402921 = 5622^2 + 3661^2 .

It is not a de Polignac number, because 45009805 - 2²³ = 36621197 is a prime.

It is a super-2 number, since 2×45009805² = 4051765092276050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4500976 + ... + 4500985.

It is an arithmetic number, because the mean of its divisors is an integer number (13502943).

Almost surely, 2^45009805 is an apocalyptic number.

It is an amenable number.

45009805 is a deficient number, since it is larger than the sum of its proper divisors (9001967).

45009805 is an equidigital number, since it uses as much as digits as its factorization.

45009805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001966.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 45009805 is about 6708.9347142449. The cubic root of 45009805 is about 355.7151621573.

Adding to 45009805 its reverse (50890054), we get a palindrome (95899859).

The spelling of 45009805 in words is "forty-five million, nine thousand, eight hundred five".