131866999 has 4 divisors (see below), whose sum is σ = 143854920. Its totient is φ = 119879080.

The previous prime is 131866991. The next prime is 131867009. The reversal of 131866999 is 999668131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131866999 - 2³ = 131866991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131866991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5993944 + ... + 5993965.

It is an arithmetic number, because the mean of its divisors is an integer number (35963730).

Almost surely, 2^131866999 is an apocalyptic number.

131866999 is a deficient number, since it is larger than the sum of its proper divisors (11987921).

131866999 is a wasteful number, since it uses less digits than its factorization.

131866999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11987920.

The product of its digits is 629856, while the sum is 52.

The square root of 131866999 is about 11483.3357087564. The cubic root of 131866999 is about 508.9932709987.

The spelling of 131866999 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, nine hundred ninety-nine".