231151431 has 64 divisors (see below), whose sum is σ = 391910400. Its totient is φ = 118142976.

The previous prime is 231151411. The next prime is 231151433. The reversal of 231151431 is 134151132.

It is not a de Polignac number, because 231151431 - 2⁶ = 231151367 is a prime.

It is a super-2 number, since 2×231151431² = 106861968106695522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 231151398 and 231151407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231151433) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 859165 + ... + 859433.

It is an arithmetic number, because the mean of its divisors is an integer number (6123600).

Almost surely, 2^231151431 is an apocalyptic number.

231151431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231151431 is a deficient number, since it is larger than the sum of its proper divisors (160758969).

231151431 is a wasteful number, since it uses less digits than its factorization.

231151431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its digits is 360, while the sum is 21.

The square root of 231151431 is about 15203.6650515591. The cubic root of 231151431 is about 613.7132910406.

The spelling of 231151431 in words is "two hundred thirty-one million, one hundred fifty-one thousand, four hundred thirty-one".