991587160 has 16 divisors (see below), whose sum is σ = 2231071200. Its totient is φ = 396634848.

The previous prime is 991587151. The next prime is 991587167. The reversal of 991587160 is 61785199.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 991587160.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991587167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12394800 + ... + 12394879.

It is an arithmetic number, because the mean of its divisors is an integer number (139441950).

Almost surely, 2^991587160 is an apocalyptic number.

It is an amenable number.

991587160 is an abundant number, since it is smaller than the sum of its proper divisors (1239484040).

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

991587160 is a wasteful number, since it uses less digits than its factorization.

991587160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24789690 (or 24789686 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 991587160 is about 31489.4769724745. The cubic root of 991587160 is about 997.1878190516.

The spelling of 991587160 in words is "nine hundred ninety-one million, five hundred eighty-seven thousand, one hundred sixty".