231188981687 has 2 divisors, whose sum is σ = 231188981688. Its totient is φ = 231188981686.

The previous prime is 231188981659. The next prime is 231188981707. The reversal of 231188981687 is 786189881132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231188981687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231188981087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115594490843 + 115594490844.

It is an arithmetic number, because the mean of its divisors is an integer number (115594490844).

Almost surely, 2^231188981687 is an apocalyptic number.

231188981687 is a deficient number, since it is larger than the sum of its proper divisors (1).

231188981687 is an equidigital number, since it uses as much as digits as its factorization.

231188981687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 62.

The spelling of 231188981687 in words is "two hundred thirty-one billion, one hundred eighty-eight million, nine hundred eighty-one thousand, six hundred eighty-seven".