136691831 has 2 divisors, whose sum is σ = 136691832. Its totient is φ = 136691830.

The previous prime is 136691791. The next prime is 136691861. The reversal of 136691831 is 138196631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136691831 - 2⁶ = 136691767 is a prime.

It is a super-2 number, since 2×136691831² = 37369313324265122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136691861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68345915 + 68345916.

It is an arithmetic number, because the mean of its divisors is an integer number (68345916).

Almost surely, 2^136691831 is an apocalyptic number.

136691831 is a deficient number, since it is larger than the sum of its proper divisors (1).

136691831 is an equidigital number, since it uses as much as digits as its factorization.

136691831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 136691831 is about 11691.5281721424. The cubic root of 136691831 is about 515.1268497032.

The spelling of 136691831 in words is "one hundred thirty-six million, six hundred ninety-one thousand, eight hundred thirty-one".