31130111321 has 4 divisors (see below), whose sum is σ = 31131789732. Its totient is φ = 31128432912.

The previous prime is 31130111297. The next prime is 31130111333. The reversal of 31130111321 is 12311103113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12311103113 = 29 ⋅424520797.

It can be written as a sum of positive squares in 2 ways, for example, as 25451735296 + 5678376025 = 159536^2 + 75355^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130111321 - 2¹⁴ = 31130094937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31130111321.

It is not an unprimeable number, because it can be changed into a prime (31130111381) 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, 811070 + ... + 848583.

It is an arithmetic number, because the mean of its divisors is an integer number (7782947433).

Almost surely, 2^31130111321 is an apocalyptic number.

It is an amenable number.

31130111321 is a deficient number, since it is larger than the sum of its proper divisors (1678411).

31130111321 is a wasteful number, since it uses less digits than its factorization.

31130111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678410.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31130111321 its reverse (12311103113), we get a palindrome (43441214434).

The spelling of 31130111321 in words is "thirty-one billion, one hundred thirty million, one hundred eleven thousand, three hundred twenty-one".