231873431 has 2 divisors, whose sum is σ = 231873432. Its totient is φ = 231873430.

The previous prime is 231873403. The next prime is 231873449. The reversal of 231873431 is 134378132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231873431 - 2¹⁴ = 231857047 is a prime.

It is a super-2 number, since 2×231873431² = 107530576007423522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231873451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115936715 + 115936716.

It is an arithmetic number, because the mean of its divisors is an integer number (115936716).

Almost surely, 2^231873431 is an apocalyptic number.

231873431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231873431 is an equidigital number, since it uses as much as digits as its factorization.

231873431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 231873431 is about 15227.3908139248. The cubic root of 231873431 is about 614.3516034117.

The spelling of 231873431 in words is "two hundred thirty-one million, eight hundred seventy-three thousand, four hundred thirty-one".