136637731 has 2 divisors, whose sum is σ = 136637732. Its totient is φ = 136637730.

The previous prime is 136637717. The next prime is 136637737. The reversal of 136637731 is 137736631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136637731 is a prime.

It is a super-2 number, since 2×136637731² = 37339739065656722, which contains 22 as substring.

It is equal to p_7732891 and since 136637731 and 7732891 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136637737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68318865 + 68318866.

It is an arithmetic number, because the mean of its divisors is an integer number (68318866).

Almost surely, 2^136637731 is an apocalyptic number.

136637731 is a deficient number, since it is larger than the sum of its proper divisors (1).

136637731 is an equidigital number, since it uses as much as digits as its factorization.

136637731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 37.

The square root of 136637731 is about 11689.2143020821. The cubic root of 136637731 is about 515.0588816328.

The spelling of 136637731 in words is "one hundred thirty-six million, six hundred thirty-seven thousand, seven hundred thirty-one".