131897816 has 8 divisors (see below), whose sum is σ = 247308420. Its totient is φ = 65948904.

The previous prime is 131897809. The next prime is 131897851. The reversal of 131897816 is 618798131.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8243606 + ... + 8243621.

Almost surely, 2^131897816 is an apocalyptic number.

It is an amenable number.

131897816 is a deficient number, since it is larger than the sum of its proper divisors (115410604).

131897816 is a wasteful number, since it uses less digits than its factorization.

131897816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16487233 (or 16487229 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The square root of 131897816 is about 11484.6774443168. The cubic root of 131897816 is about 509.0329180775.

The spelling of 131897816 in words is "one hundred thirty-one million, eight hundred ninety-seven thousand, eight hundred sixteen".