25907561 has 4 divisors (see below), whose sum is σ = 25955472. Its totient is φ = 25859652.

The previous prime is 25907551. The next prime is 25907573. The reversal of 25907561 is 16570952.

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 25907561 - 2¹⁰ = 25906537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25907501) 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, 23135 + ... + 24228.

It is an arithmetic number, because the mean of its divisors is an integer number (6488868).

Almost surely, 2^25907561 is an apocalyptic number.

It is an amenable number.

25907561 is a deficient number, since it is larger than the sum of its proper divisors (47911).

25907561 is an equidigital number, since it uses as much as digits as its factorization.

25907561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47910.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 25907561 is about 5089.9470527698. The cubic root of 25907561 is about 295.8980999681.

The spelling of 25907561 in words is "twenty-five million, nine hundred seven thousand, five hundred sixty-one".