45002561 has 4 divisors (see below), whose sum is σ = 45346224. Its totient is φ = 44658900.

The previous prime is 45002557. The next prime is 45002563. The reversal of 45002561 is 16520054.

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: 16520054 = 2 ⋅8260027.

It is a cyclic number.

It is not a de Polignac number, because 45002561 - 2² = 45002557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45002563) 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, 171635 + ... + 171896.

It is an arithmetic number, because the mean of its divisors is an integer number (11336556).

Almost surely, 2^45002561 is an apocalyptic number.

It is an amenable number.

45002561 is a deficient number, since it is larger than the sum of its proper divisors (343663).

45002561 is a wasteful number, since it uses less digits than its factorization.

45002561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343662.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 45002561 is about 6708.3948154532. The cubic root of 45002561 is about 355.6960778793.

The spelling of 45002561 in words is "forty-five million, two thousand, five hundred sixty-one".