131312278909 has 4 divisors (see below), whose sum is σ = 150071175904. Its totient is φ = 112553381916.

The previous prime is 131312278897. The next prime is 131312278913. The reversal of 131312278909 is 909872213131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131312278909 - 2²⁵ = 131278724477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131312278939) 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, 9379448487 + ... + 9379448500.

It is an arithmetic number, because the mean of its divisors is an integer number (37517793976).

Almost surely, 2^131312278909 is an apocalyptic number.

It is an amenable number.

131312278909 is a deficient number, since it is larger than the sum of its proper divisors (18758896995).

131312278909 is an equidigital number, since it uses as much as digits as its factorization.

131312278909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18758896994.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 131312278909 in words is "one hundred thirty-one billion, three hundred twelve million, two hundred seventy-eight thousand, nine hundred nine".