131386636 has 12 divisors (see below), whose sum is σ = 233165520. Its totient is φ = 64767920.

The previous prime is 131386621. The next prime is 131386637. The reversal of 131386636 is 636683131.

It is a junction number, because it is equal to n+sod(n) for n = 131386595 and 131386604.

It is not an unprimeable number, because it can be changed into a prime (131386637) 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, 231031 + ... + 231598.

It is an arithmetic number, because the mean of its divisors is an integer number (19430460).

Almost surely, 2^131386636 is an apocalyptic number.

It is an amenable number.

131386636 is a deficient number, since it is larger than the sum of its proper divisors (101778884).

131386636 is a wasteful number, since it uses less digits than its factorization.

131386636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462704 (or 462702 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The square root of 131386636 is about 11462.4009701284. The cubic root of 131386636 is about 508.3744681455.

The spelling of 131386636 in words is "one hundred thirty-one million, three hundred eighty-six thousand, six hundred thirty-six".