45091521 has 6 divisors (see below), whose sum is σ = 65132210. Its totient is φ = 30061008.

The previous prime is 45091511. The next prime is 45091537. The reversal of 45091521 is 12519054.

45091521 is a `hidden beast` number, since 4 + 50 + 91 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 3101121 = 6480^2 + 1761^2 .

It is not a de Polignac number, because 45091521 - 2¹⁵ = 45058753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45091511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2505076 + ... + 2505093.

Almost surely, 2^45091521 is an apocalyptic number.

It is an amenable number.

45091521 is a deficient number, since it is larger than the sum of its proper divisors (20040689).

45091521 is a wasteful number, since it uses less digits than its factorization.

45091521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5010175 (or 5010172 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 45091521 is about 6715.0220401723. The cubic root of 45091521 is about 355.9303008143.

The spelling of 45091521 in words is "forty-five million, ninety-one thousand, five hundred twenty-one".