131999166 has 64 divisors (see below), whose sum is σ = 321350400. Its totient is φ = 39914208.

The previous prime is 131999149. The next prime is 131999177. The reversal of 131999166 is 661999131.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39825 + ... + 43011.

It is an arithmetic number, because the mean of its divisors is an integer number (5021100).

Almost surely, 2^131999166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131999166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160675200).

131999166 is an abundant number, since it is smaller than the sum of its proper divisors (189351234).

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

131999166 is a wasteful number, since it uses less digits than its factorization.

131999166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270 (or 3264 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 131999166 is about 11489.0889978275. The cubic root of 131999166 is about 509.1632646327.

The spelling of 131999166 in words is "one hundred thirty-one million, nine hundred ninety-nine thousand, one hundred sixty-six".