25557131 has 4 divisors (see below), whose sum is σ = 25586832. Its totient is φ = 25527432.

The previous prime is 25557127. The next prime is 25557157. The reversal of 25557131 is 13175552.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25557131 - 2² = 25557127 is a prime.

It is a super-2 number, since 2×25557131² = 1306333889902322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25557094 and 25557103.

It is not an unprimeable number, because it can be changed into a prime (25557101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13520 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (6396708).

Almost surely, 2^25557131 is an apocalyptic number.

25557131 is a deficient number, since it is larger than the sum of its proper divisors (29701).

25557131 is an equidigital number, since it uses as much as digits as its factorization.

25557131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29700.

The product of its digits is 5250, while the sum is 29.

The square root of 25557131 is about 5055.4061162284. The cubic root of 25557131 is about 294.5579167831.

The spelling of 25557131 in words is "twenty-five million, five hundred fifty-seven thousand, one hundred thirty-one".