131931797 has 2 divisors, whose sum is σ = 131931798. Its totient is φ = 131931796.

The previous prime is 131931769. The next prime is 131931799. The reversal of 131931797 is 797139131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70324996 + 61606801 = 8386^2 + 7849^2 .

It is an emirp because it is prime and its reverse (797139131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131931797 - 2⁶ = 131931733 is a prime.

Together with 131931799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131931799) 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 as a sum of consecutive naturals, namely, 65965898 + 65965899.

It is an arithmetic number, because the mean of its divisors is an integer number (65965899).

Almost surely, 2^131931797 is an apocalyptic number.

It is an amenable number.

131931797 is a deficient number, since it is larger than the sum of its proper divisors (1).

131931797 is an equidigital number, since it uses as much as digits as its factorization.

131931797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35721, while the sum is 41.

The square root of 131931797 is about 11486.1567549812. The cubic root of 131931797 is about 509.0766285873.

The spelling of 131931797 in words is "one hundred thirty-one million, nine hundred thirty-one thousand, seven hundred ninety-seven".