131291666 has 8 divisors (see below), whose sum is σ = 214840944. Its totient is φ = 59678020.

The previous prime is 131291647. The next prime is 131291669. The reversal of 131291666 is 666192131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×131291666² = 34475003122111112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131291669) 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, 2983880 + ... + 2983923.

It is an arithmetic number, because the mean of its divisors is an integer number (26855118).

Almost surely, 2^131291666 is an apocalyptic number.

131291666 is a deficient number, since it is larger than the sum of its proper divisors (83549278).

131291666 is a wasteful number, since it uses less digits than its factorization.

131291666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5967816.

The product of its digits is 11664, while the sum is 35.

The square root of 131291666 is about 11458.2575464160. The cubic root of 131291666 is about 508.2519494424.

The spelling of 131291666 in words is "one hundred thirty-one million, two hundred ninety-one thousand, six hundred sixty-six".