31000032000 has 432 divisors, whose sum is σ = 127490755392. Its totient is φ = 7085260800.

The previous prime is 31000031977. The next prime is 31000032043. The reversal of 31000032000 is 23000013.

It is a happy number.

It is a super-2 number, since 2×31000032000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2008312 + ... + 2023688.

Almost surely, 2^31000032000 is an apocalyptic number.

31000032000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000032000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63745377696).

31000032000 is an abundant number, since it is smaller than the sum of its proper divisors (96490723392).

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

31000032000 is a wasteful number, since it uses less digits than its factorization.

31000032000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15421 (or 15394 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

Adding to 31000032000 its reverse (23000013), we get a palindrome (31023032013).

The spelling of 31000032000 in words is "thirty-one billion, thirty-two thousand".