231654431 has 2 divisors, whose sum is σ = 231654432. Its totient is φ = 231654430.

The previous prime is 231654421. The next prime is 231654457. The reversal of 231654431 is 134456132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231654431 is a prime.

It is a super-2 number, since 2×231654431² = 107327550803867522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231654394 and 231654403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231654421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115827215 + 115827216.

It is an arithmetic number, because the mean of its divisors is an integer number (115827216).

Almost surely, 2^231654431 is an apocalyptic number.

231654431 is a deficient number, since it is larger than the sum of its proper divisors (1).

231654431 is an equidigital number, since it uses as much as digits as its factorization.

231654431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 231654431 is about 15220.1981261743. The cubic root of 231654431 is about 614.1581280595.

The spelling of 231654431 in words is "two hundred thirty-one million, six hundred fifty-four thousand, four hundred thirty-one".