31123313016613 has 4 divisors (see below), whose sum is σ = 31123357502400. Its totient is φ = 31123268530828.

The previous prime is 31123313016611. The next prime is 31123313016619. The reversal of 31123313016613 is 31661031332113.

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 31123313016613 - 2¹ = 31123313016611 is a prime.

It is a super-2 number, since 2×31123313016613² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123313016611) 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, 21176413 + ... + 22598386.

It is an arithmetic number, because the mean of its divisors is an integer number (7780839375600).

Almost surely, 2^{31123313016613} is an apocalyptic number.

It is an amenable number.

31123313016613 is a deficient number, since it is larger than the sum of its proper divisors (44485787).

31123313016613 is an equidigital number, since it uses as much as digits as its factorization.

31123313016613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44485786.

The product of its (nonzero) digits is 17496, while the sum is 34.

Adding to 31123313016613 its reverse (31661031332113), we get a palindrome (62784344348726).

The spelling of 31123313016613 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred thirteen million, sixteen thousand, six hundred thirteen".