131981366 has 16 divisors (see below), whose sum is σ = 216207360. Its totient is φ = 59925480.

The previous prime is 131981363. The next prime is 131981389. The reversal of 131981366 is 663189131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131981363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21155 + ... + 26673.

It is an arithmetic number, because the mean of its divisors is an integer number (13512960).

Almost surely, 2^131981366 is an apocalyptic number.

131981366 is a deficient number, since it is larger than the sum of its proper divisors (84225994).

131981366 is a wasteful number, since it uses less digits than its factorization.

131981366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619.

The product of its digits is 23328, while the sum is 38.

The square root of 131981366 is about 11488.3143236943. The cubic root of 131981366 is about 509.1403768277.

The spelling of 131981366 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, three hundred sixty-six".