131188217 has 4 divisors (see below), whose sum is σ = 138092880. Its totient is φ = 124283556.

The previous prime is 131188207. The next prime is 131188229. The reversal of 131188217 is 712881131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131188217 - 2⁸ = 131187961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131188207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3452303 + ... + 3452340.

It is an arithmetic number, because the mean of its divisors is an integer number (34523220).

Almost surely, 2^131188217 is an apocalyptic number.

It is an amenable number.

131188217 is a deficient number, since it is larger than the sum of its proper divisors (6904663).

131188217 is an equidigital number, since it uses as much as digits as its factorization.

131188217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904662.

The product of its digits is 2688, while the sum is 32.

The square root of 131188217 is about 11453.7424888112. The cubic root of 131188217 is about 508.1184249192.

The spelling of 131188217 in words is "one hundred thirty-one million, one hundred eighty-eight thousand, two hundred seventeen".