231188981651 has 2 divisors, whose sum is σ = 231188981652. Its totient is φ = 231188981650.

The previous prime is 231188981599. The next prime is 231188981659. The reversal of 231188981651 is 156189881132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231188981651 - 2²² = 231184787347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231188981593 and 231188981602.

It is not a weakly prime, because it can be changed into another prime (231188981659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115594490825 + 115594490826.

It is an arithmetic number, because the mean of its divisors is an integer number (115594490826).

Almost surely, 2^231188981651 is an apocalyptic number.

231188981651 is a deficient number, since it is larger than the sum of its proper divisors (1).

231188981651 is an equidigital number, since it uses as much as digits as its factorization.

231188981651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 53.

The spelling of 231188981651 in words is "two hundred thirty-one billion, one hundred eighty-eight million, nine hundred eighty-one thousand, six hundred fifty-one".