25831281 has 12 divisors (see below), whose sum is σ = 40065072. Its totient is φ = 14760648.

The previous prime is 25831259. The next prime is 25831301. The reversal of 25831281 is 18213852.

It is not a de Polignac number, because 25831281 - 2⁵ = 25831249 is a prime.

It is a super-2 number, since 2×25831281² = 1334510156201922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25831181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87715 + ... + 88008.

It is an arithmetic number, because the mean of its divisors is an integer number (3338756).

Almost surely, 2^25831281 is an apocalyptic number.

25831281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25831281 is a deficient number, since it is larger than the sum of its proper divisors (14233791).

25831281 is a wasteful number, since it uses less digits than its factorization.

25831281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175740 (or 175733 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 25831281 is about 5082.4483273320. The cubic root of 25831281 is about 295.6074088256.

The spelling of 25831281 in words is "twenty-five million, eight hundred thirty-one thousand, two hundred eighty-one".