31012553550 has 96 divisors (see below), whose sum is σ = 84544124544. Its totient is φ = 7460752000.

The previous prime is 31012553519. The next prime is 31012553641. The reversal of 31012553550 is 5535521013.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 144412 + ... + 287888.

It is an arithmetic number, because the mean of its divisors is an integer number (880667964).

Almost surely, 2^31012553550 is an apocalyptic number.

31012553550 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 31012553550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42272062272).

31012553550 is an abundant number, since it is smaller than the sum of its proper divisors (53531570994).

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

31012553550 is a wasteful number, since it uses less digits than its factorization.

31012553550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143634 (or 143629 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 31012553550 in words is "thirty-one billion, twelve million, five hundred fifty-three thousand, five hundred fifty".