25045561 has 4 divisors (see below), whose sum is σ = 25078900. Its totient is φ = 25012224.

The previous prime is 25045523. The next prime is 25045571. The reversal of 25045561 is 16554052.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18870336 + 6175225 = 4344^2 + 2485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25045561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25045511) 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, 15516 + ... + 17053.

It is an arithmetic number, because the mean of its divisors is an integer number (6269725).

Almost surely, 2^25045561 is an apocalyptic number.

It is an amenable number.

25045561 is a deficient number, since it is larger than the sum of its proper divisors (33339).

25045561 is an equidigital number, since it uses as much as digits as its factorization.

25045561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33338.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 25045561 is about 5004.5540260846. The cubic root of 25045561 is about 292.5792942544.

The spelling of 25045561 in words is "twenty-five million, forty-five thousand, five hundred sixty-one".