31103313312013 has 4 divisors (see below), whose sum is σ = 31103327300668. Its totient is φ = 31103299323360.

The previous prime is 31103313312011. The next prime is 31103313312017. The reversal of 31103313312013 is 31021331330113.

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 8189887792804 + 22913425519209 = 2861798^2 + 4786797^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103313312013 - 2¹ = 31103313312011 is a prime.

It is a super-2 number, since 2×31103313312013² (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 (31103313312011) 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, 2834418 + ... + 8380963.

It is an arithmetic number, because the mean of its divisors is an integer number (7775831825167).

Almost surely, 2^{31103313312013} is an apocalyptic number.

It is an amenable number.

31103313312013 is a deficient number, since it is larger than the sum of its proper divisors (13988655).

31103313312013 is a wasteful number, since it uses less digits than its factorization.

31103313312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13988654.

The product of its (nonzero) digits is 1458, while the sum is 25.

Adding to 31103313312013 its reverse (31021331330113), we get a palindrome (62124644642126).

The spelling of 31103313312013 in words is "thirty-one trillion, one hundred three billion, three hundred thirteen million, three hundred twelve thousand, thirteen".