131989691 has 4 divisors (see below), whose sum is σ = 132033000. Its totient is φ = 131946384.

The previous prime is 131989687. The next prime is 131989699. The reversal of 131989691 is 196989131.

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 131989691 - 2² = 131989687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131989699) 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, 16706 + ... + 23303.

It is an arithmetic number, because the mean of its divisors is an integer number (33008250).

Almost surely, 2^131989691 is an apocalyptic number.

131989691 is a deficient number, since it is larger than the sum of its proper divisors (43309).

131989691 is an equidigital number, since it uses as much as digits as its factorization.

131989691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43308.

The product of its digits is 104976, while the sum is 47.

The square root of 131989691 is about 11488.6766426773. The cubic root of 131989691 is about 509.1510816331.

The spelling of 131989691 in words is "one hundred thirty-one million, nine hundred eighty-nine thousand, six hundred ninety-one".