131997816 has 32 divisors (see below), whose sum is σ = 366661200. Its totient is φ = 43999200.

The previous prime is 131997799. The next prime is 131997823. The reversal of 131997816 is 618799131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305335 + ... + 305766.

Almost surely, 2^131997816 is an apocalyptic number.

It is an amenable number.

131997816 is an abundant number, since it is smaller than the sum of its proper divisors (234663384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131997816 is a wasteful number, since it uses less digits than its factorization.

131997816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611116 (or 611106 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 131997816 is about 11489.0302462828. The cubic root of 131997816 is about 509.1615288320.

The spelling of 131997816 in words is "one hundred thirty-one million, nine hundred ninety-seven thousand, eight hundred sixteen".