990251331134 has 32 divisors (see below), whose sum is σ = 1698202285920. Its totient is φ = 429019379712.

The previous prime is 990251331053. The next prime is 990251331143. The reversal of 990251331134 is 431133152099.

It is a junction number, because it is equal to n+sod(n) for n = 990251331091 and 990251331100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2788139 + ... + 3123174.

It is an arithmetic number, because the mean of its divisors is an integer number (53068821435).

Almost surely, 2^990251331134 is an apocalyptic number.

990251331134 is a deficient number, since it is larger than the sum of its proper divisors (707950954786).

990251331134 is a wasteful number, since it uses less digits than its factorization.

990251331134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911724.

The product of its (nonzero) digits is 87480, while the sum is 41.

The spelling of 990251331134 in words is "nine hundred ninety billion, two hundred fifty-one million, three hundred thirty-one thousand, one hundred thirty-four".