998831671 has 4 divisors (see below), whose sum is σ = 998924344. Its totient is φ = 998739000.

The previous prime is 998831633. The next prime is 998831683. The reversal of 998831671 is 176138899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 176138899 = 23 ⋅7658213.

It is a cyclic number.

It is not a de Polignac number, because 998831671 - 2¹⁵ = 998798903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998331671) 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, 27660 + ... + 52561.

It is an arithmetic number, because the mean of its divisors is an integer number (249731086).

Almost surely, 2^998831671 is an apocalyptic number.

998831671 is a deficient number, since it is larger than the sum of its proper divisors (92673).

998831671 is a wasteful number, since it uses less digits than its factorization.

998831671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92672.

The product of its digits is 653184, while the sum is 52.

The square root of 998831671 is about 31604.2982994402. The cubic root of 998831671 is about 999.6104052356.

The spelling of 998831671 in words is "nine hundred ninety-eight million, eight hundred thirty-one thousand, six hundred seventy-one".