131686404797 has 4 divisors (see below), whose sum is σ = 131690431776. Its totient is φ = 131682377820.

The previous prime is 131686404763. The next prime is 131686404821. The reversal of 131686404797 is 797404686131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 797404686131 = 80929 ⋅9853139.

It is a cyclic number.

It is not a de Polignac number, because 131686404797 - 2⁸ = 131686404541 is a prime.

It is a super-2 number, since 2×131686404797² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131686404737) 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, 1964033 + ... + 2029974.

It is an arithmetic number, because the mean of its divisors is an integer number (32922607944).

Almost surely, 2^131686404797 is an apocalyptic number.

It is an amenable number.

131686404797 is a deficient number, since it is larger than the sum of its proper divisors (4026979).

131686404797 is an equidigital number, since it uses as much as digits as its factorization.

131686404797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026978.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 131686404797 in words is "one hundred thirty-one billion, six hundred eighty-six million, four hundred four thousand, seven hundred ninety-seven".