998831491 has 8 divisors (see below), whose sum is σ = 1142014464. Its totient is φ = 855771720.

The previous prime is 998831467. The next prime is 998831551. The reversal of 998831491 is 194138899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998831491 - 2⁷ = 998831363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998831441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12715 + ... + 46468.

It is an arithmetic number, because the mean of its divisors is an integer number (142751808).

Almost surely, 2^998831491 is an apocalyptic number.

998831491 is a deficient number, since it is larger than the sum of its proper divisors (143182973).

998831491 is a wasteful number, since it uses less digits than its factorization.

998831491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61601.

The product of its digits is 559872, while the sum is 52.

The square root of 998831491 is about 31604.2954517262. The cubic root of 998831491 is about 999.6103451888.

The spelling of 998831491 in words is "nine hundred ninety-eight million, eight hundred thirty-one thousand, four hundred ninety-one".