31801958140 has 24 divisors (see below), whose sum is σ = 70712590032. Its totient is φ = 11972501760.

The previous prime is 31801958137. The next prime is 31801958141. The reversal of 31801958140 is 4185910813.

It is a happy number.

It is a super-2 number, since 2×31801958140² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31801958093 and 31801958102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31801958141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46767246 + ... + 46767925.

It is an arithmetic number, because the mean of its divisors is an integer number (2946357918).

Almost surely, 2^31801958140 is an apocalyptic number.

It is an amenable number.

31801958140 is an abundant number, since it is smaller than the sum of its proper divisors (38910631892).

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

31801958140 is a wasteful number, since it uses less digits than its factorization.

31801958140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93535197 (or 93535195 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 31801958140 in words is "thirty-one billion, eight hundred one million, nine hundred fifty-eight thousand, one hundred forty".