131251566 has 16 divisors (see below), whose sum is σ = 268608384. Its totient is φ = 42732984.

The previous prime is 131251559. The next prime is 131251633. The reversal of 131251566 is 665152131.

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, 254106 + ... + 254621.

It is an arithmetic number, because the mean of its divisors is an integer number (16788024).

Almost surely, 2^131251566 is an apocalyptic number.

131251566 is an abundant number, since it is smaller than the sum of its proper divisors (137356818).

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

131251566 is a wasteful number, since it uses less digits than its factorization.

131251566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508775.

The product of its digits is 5400, while the sum is 30.

The square root of 131251566 is about 11456.5075830290. The cubic root of 131251566 is about 508.2001995761.

The spelling of 131251566 in words is "one hundred thirty-one million, two hundred fifty-one thousand, five hundred sixty-six".