31900055100 has 216 divisors, whose sum is σ = 97255441920. Its totient is φ = 8070370560.

The previous prime is 31900055081. The next prime is 31900055123. The reversal of 31900055100 is 155000913.

It is a super-2 number, since 2×31900055100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14884629 + ... + 14886771.

Almost surely, 2^31900055100 is an apocalyptic number.

31900055100 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 31900055100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48627720960).

31900055100 is an abundant number, since it is smaller than the sum of its proper divisors (65355386820).

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

31900055100 is a wasteful number, since it uses less digits than its factorization.

31900055100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2241 counting only the distinct ones).

The product of its (nonzero) digits is 675, while the sum is 24.

The spelling of 31900055100 in words is "thirty-one billion, nine hundred million, fifty-five thousand, one hundred".