131216636 has 12 divisors (see below), whose sum is σ = 229793760. Its totient is φ = 65561280.

The previous prime is 131216627. The next prime is 131216639. The reversal of 131216636 is 636612131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131216599 and 131216608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131216639) 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, 5060 + ... + 16971.

It is an arithmetic number, because the mean of its divisors is an integer number (19149480).

Almost surely, 2^131216636 is an apocalyptic number.

It is an amenable number.

131216636 is a deficient number, since it is larger than the sum of its proper divisors (98577124).

131216636 is a wasteful number, since it uses less digits than its factorization.

131216636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23524 (or 23522 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 131216636 is about 11454.9830205025. The cubic root of 131216636 is about 508.1551131098.

Adding to 131216636 its reverse (636612131), we get a palindrome (767828767).

The spelling of 131216636 in words is "one hundred thirty-one million, two hundred sixteen thousand, six hundred thirty-six".