991830499 has 16 divisors (see below), whose sum is σ = 1105609824. Its totient is φ = 882086400.

The previous prime is 991830397. The next prime is 991830517. The reversal of 991830499 is 994038199.

It is a cyclic number.

It is not a de Polignac number, because 991830499 - 2²⁷ = 857612771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991830899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215179 + ... + 219739.

It is an arithmetic number, because the mean of its divisors is an integer number (69100614).

Almost surely, 2^991830499 is an apocalyptic number.

991830499 is a deficient number, since it is larger than the sum of its proper divisors (113779325).

991830499 is a wasteful number, since it uses less digits than its factorization.

991830499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 991830499 is about 31493.3405500274. The cubic root of 991830499 is about 997.2693835204.

The spelling of 991830499 in words is "nine hundred ninety-one million, eight hundred thirty thousand, four hundred ninety-nine".