131661812 has 12 divisors (see below), whose sum is σ = 232167936. Its totient is φ = 65328120.

The previous prime is 131661809. The next prime is 131661833. The reversal of 131661812 is 218166131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125108 + ... + 126155.

It is an arithmetic number, because the mean of its divisors is an integer number (19347328).

Almost surely, 2^131661812 is an apocalyptic number.

It is an amenable number.

131661812 is a deficient number, since it is larger than the sum of its proper divisors (100506124).

131661812 is a wasteful number, since it uses less digits than its factorization.

131661812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251398 (or 251396 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 131661812 is about 11474.3981105764. The cubic root of 131661812 is about 508.7291335992.

The spelling of 131661812 in words is "one hundred thirty-one million, six hundred sixty-one thousand, eight hundred twelve".