998591499 has 24 divisors (see below), whose sum is σ = 1509940224. Its totient is φ = 635166000.

The previous prime is 998591479. The next prime is 998591519. The reversal of 998591499 is 994195899.

998591499 is a `hidden beast` number, since 9 + 98 + 59 + 1 + 499 = 666.

It is an interprime number because it is at equal distance from previous prime (998591479) and next prime (998591519).

It is not a de Polignac number, because 998591499 - 2⁵ = 998591467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998591459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5397 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (62914176).

Almost surely, 2^998591499 is an apocalyptic number.

998591499 is a deficient number, since it is larger than the sum of its proper divisors (511348725).

998591499 is a wasteful number, since it uses less digits than its factorization.

998591499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50519 (or 50516 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 63.

The square root of 998591499 is about 31600.4983979683. The cubic root of 998591499 is about 999.5302790635.

The spelling of 998591499 in words is "nine hundred ninety-eight million, five hundred ninety-one thousand, four hundred ninety-nine".