136631605531 has 4 divisors (see below), whose sum is σ = 138166792200. Its totient is φ = 135096418864.

The previous prime is 136631605511. The next prime is 136631605559. The reversal of 136631605531 is 135506136631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135506136631 = 73 ⋅1856248447.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136631605531 is a prime.

It is a super-2 number, since 2×136631605531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136631605511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767593201 + ... + 767593378.

It is an arithmetic number, because the mean of its divisors is an integer number (34541698050).

Almost surely, 2^136631605531 is an apocalyptic number.

136631605531 is a deficient number, since it is larger than the sum of its proper divisors (1535186669).

136631605531 is an equidigital number, since it uses as much as digits as its factorization.

136631605531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535186668.

The product of its (nonzero) digits is 145800, while the sum is 40.

The spelling of 136631605531 in words is "one hundred thirty-six billion, six hundred thirty-one million, six hundred five thousand, five hundred thirty-one".