31233013220113 has 4 divisors (see below), whose sum is σ = 31249653079860. Its totient is φ = 31216373360368.

The previous prime is 31233013220093. The next prime is 31233013220161. The reversal of 31233013220113 is 31102231033213.

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 23637322883329 + 7595690336784 = 4861823^2 + 2756028^2 .

It is a cyclic number.

It is not a de Polignac number, because 31233013220113 - 2⁴¹ = 29033989964561 is a prime.

It is a super-2 number, since 2×31233013220113² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31233013220173) 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, 8319927058 + ... + 8319930811.

It is an arithmetic number, because the mean of its divisors is an integer number (7812413269965).

Almost surely, 2^{31233013220113} is an apocalyptic number.

It is an amenable number.

31233013220113 is a deficient number, since it is larger than the sum of its proper divisors (16639859747).

31233013220113 is a wasteful number, since it uses less digits than its factorization.

31233013220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16639859746.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31233013220113 its reverse (31102231033213), we get a palindrome (62335244253326).

The spelling of 31233013220113 in words is "thirty-one trillion, two hundred thirty-three billion, thirteen million, two hundred twenty thousand, one hundred thirteen".