45512561 has 4 divisors (see below), whose sum is σ = 47491392. Its totient is φ = 43533732.

The previous prime is 45512549. The next prime is 45512563. The reversal of 45512561 is 16521554.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45512561 - 2¹⁸ = 45250417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45512563) 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, 989381 + ... + 989426.

It is an arithmetic number, because the mean of its divisors is an integer number (11872848).

Almost surely, 2^45512561 is an apocalyptic number.

It is an amenable number.

45512561 is a deficient number, since it is larger than the sum of its proper divisors (1978831).

45512561 is a wasteful number, since it uses less digits than its factorization.

45512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978830.

The product of its digits is 6000, while the sum is 29.

The square root of 45512561 is about 6746.2998006315. The cubic root of 45512561 is about 357.0346980897.

The spelling of 45512561 in words is "forty-five million, five hundred twelve thousand, five hundred sixty-one".