231781025 has 36 divisors (see below), whose sum is σ = 335871360. Its totient is φ = 158205600.

The previous prime is 231781013. The next prime is 231781037. The reversal of 231781025 is 520187132.

It is an interprime number because it is at equal distance from previous prime (231781013) and next prime (231781037).

It is not a de Polignac number, because 231781025 - 2²² = 227586721 is a prime.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 527756 + ... + 528194.

It is an arithmetic number, because the mean of its divisors is an integer number (9329760).

Almost surely, 2^231781025 is an apocalyptic number.

231781025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231781025 is a deficient number, since it is larger than the sum of its proper divisors (104090335).

231781025 is a wasteful number, since it uses less digits than its factorization.

231781025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 231781025 is about 15224.3563082319. The cubic root of 231781025 is about 614.2699822776.

The spelling of 231781025 in words is "two hundred thirty-one million, seven hundred eighty-one thousand, twenty-five".