45256561 has 4 divisors (see below), whose sum is σ = 51721792. Its totient is φ = 38791332.

The previous prime is 45256543. The next prime is 45256573. The reversal of 45256561 is 16565254.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16565254 = 2 ⋅8282627.

It is a cyclic number.

It is not a de Polignac number, because 45256561 - 2⁵ = 45256529 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45256531) 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, 3232605 + ... + 3232618.

It is an arithmetic number, because the mean of its divisors is an integer number (12930448).

Almost surely, 2^45256561 is an apocalyptic number.

It is an amenable number.

45256561 is a deficient number, since it is larger than the sum of its proper divisors (6465231).

45256561 is an equidigital number, since it uses as much as digits as its factorization.

45256561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6465230.

The product of its digits is 36000, while the sum is 34.

The square root of 45256561 is about 6727.2996811499. The cubic root of 45256561 is about 356.3640203001.

The spelling of 45256561 in words is "forty-five million, two hundred fifty-six thousand, five hundred sixty-one".