231518047 has 2 divisors, whose sum is σ = 231518048. Its totient is φ = 231518046.

The previous prime is 231518039. The next prime is 231518101. The reversal of 231518047 is 740815132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231518047 - 2³ = 231518039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231528047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115759023 + 115759024.

It is an arithmetic number, because the mean of its divisors is an integer number (115759024).

Almost surely, 2^231518047 is an apocalyptic number.

231518047 is a deficient number, since it is larger than the sum of its proper divisors (1).

231518047 is an equidigital number, since it uses as much as digits as its factorization.

231518047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 231518047 is about 15215.7171043628. The cubic root of 231518047 is about 614.0375781165.

The spelling of 231518047 in words is "two hundred thirty-one million, five hundred eighteen thousand, forty-seven".