998275621 has 16 divisors (see below), whose sum is σ = 1152296320. Its totient is φ = 847143360.

The previous prime is 998275589. The next prime is 998275639. The reversal of 998275621 is 126572899.

It is not a de Polignac number, because 998275621 - 2⁵ = 998275589 is a prime.

It is the 31596-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998275021) by changing a digit.

It is a nontrivial repunit in base 31595.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408415 + ... + 410851.

It is an arithmetic number, because the mean of its divisors is an integer number (72018520).

Almost surely, 2^998275621 is an apocalyptic number.

It is an amenable number.

998275621 is a deficient number, since it is larger than the sum of its proper divisors (154020699).

998275621 is a wasteful number, since it uses less digits than its factorization.

998275621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004.

The product of its digits is 544320, while the sum is 49.

The square root of 998275621 is about 31595.5000118688. The cubic root of 998275621 is about 999.4248762961.

The spelling of 998275621 in words is "nine hundred ninety-eight million, two hundred seventy-five thousand, six hundred twenty-one".