45509623 has 4 divisors (see below), whose sum is σ = 45951568. Its totient is φ = 45067680.

The previous prime is 45509567. The next prime is 45509627. The reversal of 45509623 is 32690554.

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

It is a cyclic number.

It is not a de Polignac number, because 45509623 - 2²¹ = 43412471 is a prime.

It is a super-2 number, since 2×45509623² = 4142251571204258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45509627) 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, 220818 + ... + 221023.

It is an arithmetic number, because the mean of its divisors is an integer number (11487892).

Almost surely, 2^45509623 is an apocalyptic number.

45509623 is a deficient number, since it is larger than the sum of its proper divisors (441945).

45509623 is a wasteful number, since it uses less digits than its factorization.

45509623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441944.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 45509623 is about 6746.0820481225. The cubic root of 45509623 is about 357.0270152985.

The spelling of 45509623 in words is "forty-five million, five hundred nine thousand, six hundred twenty-three".