991502130564 has 405 divisors, whose sum is σ = 2938405468999. Its totient is φ = 291314279520.

The previous prime is 991502130503. The next prime is 991502130587. The reversal of 991502130564 is 465031205199.

The square root of 991502130564 is 995742.

It is a perfect power (a square), and thus also a powerful number.

991502130564 is a `hidden beast` number, since 9 + 9 + 1 + 50 + 2 + 1 + 30 + 564 = 666.

991502130564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 9266374999 + ... + 9266375105.

Almost surely, 2^991502130564 is an apocalyptic number.

991502130564 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

991502130564 is the 995742-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991502130564

991502130564 is an abundant number, since it is smaller than the sum of its proper divisors (1946903338435).

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

991502130564 is a wasteful number, since it uses less digits than its factorization.

991502130564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 991502130564 in words is "nine hundred ninety-one billion, five hundred two million, one hundred thirty thousand, five hundred sixty-four".