31990251930 has 256 divisors, whose sum is σ = 100019404800. Its totient is φ = 6358901760.

The previous prime is 31990251907. The next prime is 31990251967. The reversal of 31990251930 is 3915209913.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9905556 + ... + 9908784.

It is an arithmetic number, because the mean of its divisors is an integer number (390700800).

Almost surely, 2^31990251930 is an apocalyptic number.

31990251930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31990251930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50009702400).

31990251930 is an abundant number, since it is smaller than the sum of its proper divisors (68029152870).

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

31990251930 is a wasteful number, since it uses less digits than its factorization.

31990251930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469.

The product of its (nonzero) digits is 65610, while the sum is 42.

The spelling of 31990251930 in words is "thirty-one billion, nine hundred ninety million, two hundred fifty-one thousand, nine hundred thirty".