231820815427 has 2 divisors, whose sum is σ = 231820815428. Its totient is φ = 231820815426.

The previous prime is 231820815301. The next prime is 231820815437. The reversal of 231820815427 is 724518028132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231820815427 - 2²⁷ = 231686597699 is a prime.

It is not a weakly prime, because it can be changed into another prime (231820815437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115910407713 + 115910407714.

It is an arithmetic number, because the mean of its divisors is an integer number (115910407714).

Almost surely, 2^231820815427 is an apocalyptic number.

231820815427 is a deficient number, since it is larger than the sum of its proper divisors (1).

231820815427 is an equidigital number, since it uses as much as digits as its factorization.

231820815427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 231820815427 in words is "two hundred thirty-one billion, eight hundred twenty million, eight hundred fifteen thousand, four hundred twenty-seven".