31000817317 has 4 divisors (see below), whose sum is σ = 31001240736. Its totient is φ = 31000393900.

The previous prime is 31000817303. The next prime is 31000817339. The reversal of 31000817317 is 71371800013.

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-31000817317 is a prime.

It is a super-2 number, since 2×31000817317² (a number of 22 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 (31000817417) 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, 70483 + ... + 258784.

It is an arithmetic number, because the mean of its divisors is an integer number (7750310184).

Almost surely, 2^31000817317 is an apocalyptic number.

It is an amenable number.

31000817317 is a deficient number, since it is larger than the sum of its proper divisors (423419).

31000817317 is an equidigital number, since it uses as much as digits as its factorization.

31000817317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423418.

The product of its (nonzero) digits is 3528, while the sum is 31.

The spelling of 31000817317 in words is "thirty-one billion, eight hundred seventeen thousand, three hundred seventeen".