231787427 has 2 divisors, whose sum is σ = 231787428. Its totient is φ = 231787426.

The previous prime is 231787411. The next prime is 231787429. The reversal of 231787427 is 724787132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231787427 - 2⁴ = 231787411 is a prime.

It is a super-2 number, since 2×231787427² = 107450822630560658, which contains 22 as substring.

Together with 231787429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231787429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115893713 + 115893714.

It is an arithmetic number, because the mean of its divisors is an integer number (115893714).

Almost surely, 2^231787427 is an apocalyptic number.

231787427 is a deficient number, since it is larger than the sum of its proper divisors (1).

231787427 is an equidigital number, since it uses as much as digits as its factorization.

231787427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 41.

The square root of 231787427 is about 15224.5665619748. The cubic root of 231787427 is about 614.2756377883.

The spelling of 231787427 in words is "two hundred thirty-one million, seven hundred eighty-seven thousand, four hundred twenty-seven".