31401868488 has 32 divisors (see below), whose sum is σ = 78513507360. Its totient is φ = 10466111360.

The previous prime is 31401868483. The next prime is 31401868493. The reversal of 31401868488 is 88486810413.

It is an interprime number because it is at equal distance from previous prime (31401868483) and next prime (31401868493).

It is a super-2 number, since 2×31401868488² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31401868488.

It is not an unprimeable number, because it can be changed into a prime (31401868483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159043 + ... + 296813.

It is an arithmetic number, because the mean of its divisors is an integer number (2453547105).

Almost surely, 2^31401868488 is an apocalyptic number.

It is an amenable number.

31401868488 is an abundant number, since it is smaller than the sum of its proper divisors (47111638872).

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

31401868488 is a wasteful number, since it uses less digits than its factorization.

31401868488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147277 (or 147273 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The spelling of 31401868488 in words is "thirty-one billion, four hundred one million, eight hundred sixty-eight thousand, four hundred eighty-eight".