9998885531 has 8 divisors (see below), whose sum is σ = 10015196400. Its totient is φ = 9982589440.

The previous prime is 9998885497. The next prime is 9998885543. The reversal of 9998885531 is 1355888999.

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 9998885531 - 2²² = 9994691227 is a prime.

It is a super-2 number, since 2×9998885531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9998885551) 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, 2656691 + ... + 2660451.

It is an arithmetic number, because the mean of its divisors is an integer number (1251899550).

Almost surely, 2^9998885531 is an apocalyptic number.

9998885531 is a deficient number, since it is larger than the sum of its proper divisors (16310869).

9998885531 is a wasteful number, since it uses less digits than its factorization.

9998885531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389.

The product of its digits is 27993600, while the sum is 65.

The square root of 9998885531 is about 99994.4274997362. The cubic root of 9998885531 is about 2154.3546520360.

The spelling of 9998885531 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-five thousand, five hundred thirty-one".