990251331100 has 144 divisors (see below), whose sum is σ = 2375213476608. Its totient is φ = 356435368960.

The previous prime is 990251331053. The next prime is 990251331143. The reversal of 990251331100 is 1133152099.

990251331100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 125233347 + ... + 125241253.

It is an arithmetic number, because the mean of its divisors is an integer number (16494538032).

Almost surely, 2^990251331100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990251331100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1187606738304).

990251331100 is an abundant number, since it is smaller than the sum of its proper divisors (1384962145508).

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

990251331100 is a wasteful number, since it uses less digits than its factorization.

990251331100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11164 (or 11157 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 34.

Adding to 990251331100 its reverse (1133152099), we get a palindrome (991384483199).

The spelling of 990251331100 in words is "nine hundred ninety billion, two hundred fifty-one million, three hundred thirty-one thousand, one hundred".