45420521 has 4 divisors (see below), whose sum is σ = 45584772. Its totient is φ = 45256272.

The previous prime is 45420511. The next prime is 45420563. The reversal of 45420521 is 12502454.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7425625 + 37994896 = 2725^2 + 6164^2 .

It is a cyclic number.

It is not a de Polignac number, because 45420521 - 2⁶ = 45420457 is a prime.

It is a super-2 number, since 2×45420521² = 4126047455822882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45420511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81710 + ... + 82263.

It is an arithmetic number, because the mean of its divisors is an integer number (11396193).

Almost surely, 2^45420521 is an apocalyptic number.

It is an amenable number.

45420521 is a deficient number, since it is larger than the sum of its proper divisors (164251).

45420521 is a wasteful number, since it uses less digits than its factorization.

45420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164250.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 45420521 is about 6739.4748311719. The cubic root of 45420521 is about 356.7938587133.

Adding to 45420521 its reverse (12502454), we get a palindrome (57922975).

The spelling of 45420521 in words is "forty-five million, four hundred twenty thousand, five hundred twenty-one".