99999331 has 8 divisors (see below), whose sum is σ = 104459040. Its totient is φ = 95548992.

The previous prime is 99999329. The next prime is 99999343. The reversal of 99999331 is 13399999.

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

It is not a de Polignac number, because 99999331 - 2¹ = 99999329 is a prime.

It is a super-2 number, since 2×99999331² = 19999732400895122, which 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 (99999131) 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, 27961 + ... + 31333.

It is an arithmetic number, because the mean of its divisors is an integer number (13057380).

Almost surely, 2^99999331 is an apocalyptic number.

99999331 is a deficient number, since it is larger than the sum of its proper divisors (4459709).

99999331 is a wasteful number, since it uses less digits than its factorization.

99999331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685.

The product of its digits is 531441, while the sum is 52.

The square root of 99999331 is about 9999.9665499441. The cubic root of 99999331 is about 464.1578482847.

The spelling of 99999331 in words is "ninety-nine million, nine hundred ninety-nine thousand, three hundred thirty-one".