131989396409 has 4 divisors (see below), whose sum is σ = 142142426916. Its totient is φ = 121836365904.

The previous prime is 131989396391. The next prime is 131989396433. The reversal of 131989396409 is 904693989131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71785413184 + 60203983225 = 267928^2 + 245365^2 .

It is a cyclic number.

It is not a de Polignac number, because 131989396409 - 2²⁰ = 131988347833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131989396489) 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, 5076515234 + ... + 5076515259.

It is an arithmetic number, because the mean of its divisors is an integer number (35535606729).

Almost surely, 2^131989396409 is an apocalyptic number.

It is an amenable number.

131989396409 is a deficient number, since it is larger than the sum of its proper divisors (10153030507).

131989396409 is a wasteful number, since it uses less digits than its factorization.

131989396409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10153030506.

The product of its (nonzero) digits is 11337408, while the sum is 62.

The spelling of 131989396409 in words is "one hundred thirty-one billion, nine hundred eighty-nine million, three hundred ninety-six thousand, four hundred nine".