131891808 has 24 divisors (see below), whose sum is σ = 346216248. Its totient is φ = 43963904.

The previous prime is 131891779. The next prime is 131891813. The reversal of 131891808 is 808198131.

It is a tau number, because it is divible by the number of its divisors (24).

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, 686841 + ... + 687032.

It is an arithmetic number, because the mean of its divisors is an integer number (14425677).

Almost surely, 2^131891808 is an apocalyptic number.

It is an amenable number.

131891808 is an abundant number, since it is smaller than the sum of its proper divisors (214324440).

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

131891808 is a wasteful number, since it uses less digits than its factorization.

131891808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373886 (or 1373878 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 39.

The square root of 131891808 is about 11484.4158754375. The cubic root of 131891808 is about 509.0251890736.

The spelling of 131891808 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, eight hundred eight".