136938308531 has 4 divisors (see below), whose sum is σ = 141660319200. Its totient is φ = 132216297864.

The previous prime is 136938308519. The next prime is 136938308539. The reversal of 136938308531 is 135803839631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136938308531 - 2²⁶ = 136871199667 is a prime.

It is a super-2 number, since 2×136938308531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136938308531.

It is not an unprimeable number, because it can be changed into a prime (136938308539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361005291 + ... + 2361005348.

It is an arithmetic number, because the mean of its divisors is an integer number (35415079800).

Almost surely, 2^136938308531 is an apocalyptic number.

136938308531 is a deficient number, since it is larger than the sum of its proper divisors (4722010669).

136938308531 is an equidigital number, since it uses as much as digits as its factorization.

136938308531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722010668.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 136938308531 in words is "one hundred thirty-six billion, nine hundred thirty-eight million, three hundred eight thousand, five hundred thirty-one".