25870131 has 16 divisors (see below), whose sum is σ = 43801600. Its totient is φ = 14782824.

The previous prime is 25870129. The next prime is 25870157. The reversal of 25870131 is 13107852.

It is not a de Polignac number, because 25870131 - 2¹ = 25870129 is a prime.

It is a super-2 number, since 2×25870131² = 1338527355914322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25870095 and 25870104.

It is not an unprimeable number, because it can be changed into a prime (25870111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68251 + ... + 68628.

It is an arithmetic number, because the mean of its divisors is an integer number (2737600).

Almost surely, 2^25870131 is an apocalyptic number.

25870131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25870131 is a deficient number, since it is larger than the sum of its proper divisors (17931469).

25870131 is a wasteful number, since it uses less digits than its factorization.

25870131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136895 (or 136889 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 25870131 is about 5086.2688682373. The cubic root of 25870131 is about 295.7555314989.

Adding to 25870131 its reverse (13107852), we get a palindrome (38977983).

The spelling of 25870131 in words is "twenty-five million, eight hundred seventy thousand, one hundred thirty-one".