31143167988 has 12 divisors (see below), whose sum is σ = 72667392000. Its totient is φ = 10381055992.

The previous prime is 31143167987. The next prime is 31143167989. The reversal of 31143167988 is 88976134113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31143167987) and next prime (31143167989).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31143167988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143167987) 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, 1297631988 + ... + 1297632011.

It is an arithmetic number, because the mean of its divisors is an integer number (6055616000).

Almost surely, 2^31143167988 is an apocalyptic number.

It is an amenable number.

31143167988 is an abundant number, since it is smaller than the sum of its proper divisors (41524224012).

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

31143167988 is a wasteful number, since it uses less digits than its factorization.

31143167988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595264006 (or 2595264004 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The spelling of 31143167988 in words is "thirty-one billion, one hundred forty-three million, one hundred sixty-seven thousand, nine hundred eighty-eight".