25261557 has 4 divisors (see below), whose sum is σ = 33682080. Its totient is φ = 16841036.

The previous prime is 25261547. The next prime is 25261571. The reversal of 25261557 is 75516252.

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 25261557 - 2¹⁶ = 25196021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25261547) 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, 4210257 + ... + 4210262.

It is an arithmetic number, because the mean of its divisors is an integer number (8420520).

Almost surely, 2^25261557 is an apocalyptic number.

It is an amenable number.

25261557 is a deficient number, since it is larger than the sum of its proper divisors (8420523).

25261557 is an equidigital number, since it uses as much as digits as its factorization.

25261557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8420522.

The product of its digits is 21000, while the sum is 33.

The square root of 25261557 is about 5026.0876434857. The cubic root of 25261557 is about 293.4179678591.

The spelling of 25261557 in words is "twenty-five million, two hundred sixty-one thousand, five hundred fifty-seven".