31405500000 has 504 divisors, whose sum is σ = 127711177776. Its totient is φ = 7171200000.

The previous prime is 31405499987. The next prime is 31405500013. The reversal of 31405500000 is 550413.

It is an interprime number because it is at equal distance from previous prime (31405499987) and next prime (31405500013).

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 31499502 + ... + 31500498.

It is an arithmetic number, because the mean of its divisors is an integer number (253395194).

Almost surely, 2^31405500000 is an apocalyptic number.

31405500000 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 31405500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63855588888).

31405500000 is an abundant number, since it is smaller than the sum of its proper divisors (96305677776).

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

31405500000 is an frugal number, since it uses more digits than its factorization.

31405500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The spelling of 31405500000 in words is "thirty-one billion, four hundred five million, five hundred thousand".