31311023232113 has 4 divisors (see below), whose sum is σ = 31468365057600. Its totient is φ = 31153681406628.

The previous prime is 31311023232109. The next prime is 31311023232127. The reversal of 31311023232113 is 31123232011313.

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 31311023232113 - 2² = 31311023232109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311023238113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78670912445 + ... + 78670912842.

It is an arithmetic number, because the mean of its divisors is an integer number (7867091264400).

Almost surely, 2^{31311023232113} is an apocalyptic number.

It is an amenable number.

31311023232113 is a deficient number, since it is larger than the sum of its proper divisors (157341825487).

31311023232113 is a wasteful number, since it uses less digits than its factorization.

31311023232113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157341825486.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31311023232113 its reverse (31123232011313), we get a palindrome (62434255243426).

The spelling of 31311023232113 in words is "thirty-one trillion, three hundred eleven billion, twenty-three million, two hundred thirty-two thousand, one hundred thirteen".