131031313 has 4 divisors (see below), whose sum is σ = 149750080. Its totient is φ = 112312548.

The previous prime is 131031301. The next prime is 131031337. The reversal of 131031313 is 313130131.

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: 313130131 = 6043 ⋅51817.

It is a cyclic number.

It is not a de Polignac number, because 131031313 - 2²⁵ = 97476881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131031013) 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, 9359373 + ... + 9359386.

It is an arithmetic number, because the mean of its divisors is an integer number (37437520).

Almost surely, 2^131031313 is an apocalyptic number.

It is an amenable number.

131031313 is a deficient number, since it is larger than the sum of its proper divisors (18718767).

131031313 is an equidigital number, since it uses as much as digits as its factorization.

131031313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18718766.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 131031313 is about 11446.8909752823. The cubic root of 131031313 is about 507.9157704916.

Adding to 131031313 its reverse (313130131), we get a palindrome (444161444).

It can be divided in two parts, 1310 and 31313, that added together give a palindrome (32623).

The spelling of 131031313 in words is "one hundred thirty-one million, thirty-one thousand, three hundred thirteen".