131790691 has 4 divisors (see below), whose sum is σ = 131824584. Its totient is φ = 131756800.

The previous prime is 131790689. The next prime is 131790721. The reversal of 131790691 is 196097131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196097131 = 1979 ⋅99089.

It is a cyclic number.

It is not a de Polignac number, because 131790691 - 2¹ = 131790689 is a prime.

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 131790691.

It is not an unprimeable number, because it can be changed into a prime (131790611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10225 + ... + 19186.

It is an arithmetic number, because the mean of its divisors is an integer number (32956146).

Almost surely, 2^131790691 is an apocalyptic number.

131790691 is a deficient number, since it is larger than the sum of its proper divisors (33893).

131790691 is an equidigital number, since it uses as much as digits as its factorization.

131790691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33892.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 131790691 is about 11480.0126742090. The cubic root of 131790691 is about 508.8950716686.

The spelling of 131790691 in words is "one hundred thirty-one million, seven hundred ninety thousand, six hundred ninety-one".