31130131313 has 4 divisors (see below), whose sum is σ = 31208545140. Its totient is φ = 31051717488.

The previous prime is 31130131289. The next prime is 31130131327. The reversal of 31130131313 is 31313103113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31313103113 = 1021 ⋅30669053.

It can be written as a sum of positive squares in 2 ways, for example, as 8932707169 + 22197424144 = 94513^2 + 148988^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130131313 - 2¹⁴ = 31130114929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130133313) 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, 39206318 + ... + 39207111.

It is an arithmetic number, because the mean of its divisors is an integer number (7802136285).

Almost surely, 2^31130131313 is an apocalyptic number.

It is an amenable number.

31130131313 is a deficient number, since it is larger than the sum of its proper divisors (78413827).

31130131313 is an equidigital number, since it uses as much as digits as its factorization.

31130131313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78413826.

The product of its (nonzero) digits is 243, while the sum is 20.

Adding to 31130131313 its reverse (31313103113), we get a palindrome (62443234426).

The spelling of 31130131313 in words is "thirty-one billion, one hundred thirty million, one hundred thirty-one thousand, three hundred thirteen".