31316871918 has 8 divisors (see below), whose sum is σ = 62633743848. Its totient is φ = 10438957304.

The previous prime is 31316871917. The next prime is 31316871919. The reversal of 31316871918 is 81917861313.

It is an interprime number because it is at equal distance from previous prime (31316871917) and next prime (31316871919).

It is a sphenic number, since it is the product of 3 distinct primes.

31316871918 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316871917) 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, 2609739321 + ... + 2609739332.

It is an arithmetic number, because the mean of its divisors is an integer number (7829217981).

Almost surely, 2^31316871918 is an apocalyptic number.

31316871918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31316871918 is a wasteful number, since it uses less digits than its factorization.

31316871918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219478658.

The product of its digits is 217728, while the sum is 48.

The spelling of 31316871918 in words is "thirty-one billion, three hundred sixteen million, eight hundred seventy-one thousand, nine hundred eighteen".