231251400 has 72 divisors (see below), whose sum is σ = 776625330. Its totient is φ = 61666560.

The previous prime is 231251399. The next prime is 231251401. The reversal of 231251400 is 4152132.

231251400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231251399) and next prime (231251401).

It can be written as a sum of positive squares in 3 ways, for example, as 219099204 + 12152196 = 14802^2 + 3486^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231251401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62437 + ... + 66036.

Almost surely, 2^231251400 is an apocalyptic number.

231251400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231251400 is an abundant number, since it is smaller than the sum of its proper divisors (545373930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231251400 is a wasteful number, since it uses less digits than its factorization.

231251400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128495 (or 128483 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 231251400 is about 15206.9523573923. The cubic root of 231251400 is about 613.8017517541.

The spelling of 231251400 in words is "two hundred thirty-one million, two hundred fifty-one thousand, four hundred".