131666131 has 4 divisors (see below), whose sum is σ = 132831432. Its totient is φ = 130500832.

The previous prime is 131666123. The next prime is 131666159.

It is a happy number.

131666131 is nontrivially palindromic in base 10.

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 131666131 - 2³ = 131666123 is a prime.

It is a super-2 number, since 2×131666131² = 34671940105018322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131666131.

It is not an unprimeable number, because it can be changed into a prime (131666531) 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, 582481 + ... + 582706.

It is an arithmetic number, because the mean of its divisors is an integer number (33207858).

Almost surely, 2^131666131 is an apocalyptic number.

131666131 is a deficient number, since it is larger than the sum of its proper divisors (1165301).

131666131 is a wasteful number, since it uses less digits than its factorization.

131666131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165300.

The product of its digits is 1944, while the sum is 28.

The square root of 131666131 is about 11474.5863106258. The cubic root of 131666131 is about 508.7346962779.

The spelling of 131666131 in words is "one hundred thirty-one million, six hundred sixty-six thousand, one hundred thirty-one".