31121332111313 has 4 divisors (see below), whose sum is σ = 31121788096308. Its totient is φ = 31120876126320.

The previous prime is 31121332111291. The next prime is 31121332111339. The reversal of 31121332111313 is 31311123312113.

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 6434177218624 + 24687154892689 = 2536568^2 + 4968617^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121332111313 - 2⁸ = 31121332111057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121332111213) 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, 227890106 + ... + 228026627.

It is an arithmetic number, because the mean of its divisors is an integer number (7780447024077).

Almost surely, 2^{31121332111313} is an apocalyptic number.

It is an amenable number.

31121332111313 is a deficient number, since it is larger than the sum of its proper divisors (455984995).

31121332111313 is an equidigital number, since it uses as much as digits as its factorization.

31121332111313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455984994.

The product of its digits is 972, while the sum is 26.

Adding to 31121332111313 its reverse (31311123312113), we get a palindrome (62432455423426).

The spelling of 31121332111313 in words is "thirty-one trillion, one hundred twenty-one billion, three hundred thirty-two million, one hundred eleven thousand, three hundred thirteen".