199999331 has 12 divisors (see below), whose sum is σ = 233078472. Its totient is φ = 171114048.

The previous prime is 199999309. The next prime is 199999333. The reversal of 199999331 is 133999991.

It is not a de Polignac number, because 199999331 - 2¹⁴ = 199982947 is a prime.

It is a super-2 number, since 2×199999331² = 79999464800895122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (199999333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25616 + ... + 32498.

It is an arithmetic number, because the mean of its divisors is an integer number (19423206).

Almost surely, 2^199999331 is an apocalyptic number.

199999331 is a deficient number, since it is larger than the sum of its proper divisors (33079141).

199999331 is an equidigital number, since it uses as much as digits as its factorization.

199999331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490 (or 7483 counting only the distinct ones).

The product of its digits is 531441, while the sum is 53.

The square root of 199999331 is about 14142.1119709893. Note that the first 3 decimals coincide. The cubic root of 199999331 is about 584.8028955859.

The spelling of 199999331 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, three hundred thirty-one".