199999431 has 12 divisors (see below), whose sum is σ = 289333720. Its totient is φ = 133127280.

The previous prime is 199999427. The next prime is 199999447. The reversal of 199999431 is 134999991.

It is not a de Polignac number, because 199999431 - 2² = 199999427 is a prime.

It is a super-2 number, since 2×199999431² = 79999544800647522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999451) 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, 10861 + ... + 22758.

Almost surely, 2^199999431 is an apocalyptic number.

199999431 is a deficient number, since it is larger than the sum of its proper divisors (89334289).

199999431 is a wasteful number, since it uses less digits than its factorization.

199999431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34286 (or 34283 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 199999431 is about 14142.1155065287. The cubic root of 199999431 is about 584.8029930533.

The spelling of 199999431 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred thirty-one".