136431857 has 2 divisors, whose sum is σ = 136431858. Its totient is φ = 136431856.

The previous prime is 136431821. The next prime is 136431859. The reversal of 136431857 is 758134631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133079296 + 3352561 = 11536^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 136431857 - 2⁸ = 136431601 is a prime.

It is a super-2 number, since 2×136431857² = 37227303208936898, which contains 22 as substring.

Together with 136431859, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136431857.

It is not a weakly prime, because it can be changed into another prime (136431859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68215928 + 68215929.

It is an arithmetic number, because the mean of its divisors is an integer number (68215929).

Almost surely, 2^136431857 is an apocalyptic number.

It is an amenable number.

136431857 is a deficient number, since it is larger than the sum of its proper divisors (1).

136431857 is an equidigital number, since it uses as much as digits as its factorization.

136431857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 136431857 is about 11680.4048303130. The cubic root of 136431857 is about 514.8000694390.

The spelling of 136431857 in words is "one hundred thirty-six million, four hundred thirty-one thousand, eight hundred fifty-seven".