31131070471717 has 4 divisors (see below), whose sum is σ = 31132920115456. Its totient is φ = 31129220827980.

The previous prime is 31131070471681. The next prime is 31131070471729. The reversal of 31131070471717 is 71717407013113.

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 a de Polignac number, because none of the positive numbers 2^k-31131070471717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131070472717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924796623 + ... + 924830284.

It is an arithmetic number, because the mean of its divisors is an integer number (7783230028864).

Almost surely, 2^{31131070471717} is an apocalyptic number.

It is an amenable number.

31131070471717 is a deficient number, since it is larger than the sum of its proper divisors (1849643739).

31131070471717 is a wasteful number, since it uses less digits than its factorization.

31131070471717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849643738.

The product of its (nonzero) digits is 86436, while the sum is 43.

The spelling of 31131070471717 in words is "thirty-one trillion, one hundred thirty-one billion, seventy million, four hundred seventy-one thousand, seven hundred seventeen".