231137887 has 2 divisors, whose sum is σ = 231137888. Its totient is φ = 231137886.

The previous prime is 231137843. The next prime is 231137897. The reversal of 231137887 is 788731132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231137887 - 2¹⁹ = 230613599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231137807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115568943 + 115568944.

It is an arithmetic number, because the mean of its divisors is an integer number (115568944).

Almost surely, 2^231137887 is an apocalyptic number.

231137887 is a deficient number, since it is larger than the sum of its proper divisors (1).

231137887 is an equidigital number, since it uses as much as digits as its factorization.

231137887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 231137887 is about 15203.2196261187. The cubic root of 231137887 is about 613.7013042446.

The spelling of 231137887 in words is "two hundred thirty-one million, one hundred thirty-seven thousand, eight hundred eighty-seven".