31069112813 has 4 divisors (see below), whose sum is σ = 31344060828. Its totient is φ = 30794164800.

The previous prime is 31069112771. The next prime is 31069112821. The reversal of 31069112813 is 31821196013.

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 2461449769 + 28607663044 = 49613^2 + 169138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31069112813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31069112843) 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, 137473838 + ... + 137474063.

It is an arithmetic number, because the mean of its divisors is an integer number (7836015207).

Almost surely, 2^31069112813 is an apocalyptic number.

It is an amenable number.

31069112813 is a deficient number, since it is larger than the sum of its proper divisors (274948015).

31069112813 is a wasteful number, since it uses less digits than its factorization.

31069112813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274948014.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 31069112813 in words is "thirty-one billion, sixty-nine million, one hundred twelve thousand, eight hundred thirteen".