131820906 has 16 divisors (see below), whose sum is σ = 301305024. Its totient is φ = 37663104.

The previous prime is 131820883. The next prime is 131820937. The reversal of 131820906 is 609028131.

It is a nialpdrome in base 8.

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, 1569255 + ... + 1569338.

It is an arithmetic number, because the mean of its divisors is an integer number (18831564).

Almost surely, 2^131820906 is an apocalyptic number.

131820906 is an abundant number, since it is smaller than the sum of its proper divisors (169484118).

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

131820906 is a wasteful number, since it uses less digits than its factorization.

131820906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138605.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 131820906 is about 11481.3285816581. The cubic root of 131820906 is about 508.9339593158.

The spelling of 131820906 in words is "one hundred thirty-one million, eight hundred twenty thousand, nine hundred six".