199431 has 6 divisors (see below), whose sum is σ = 288080. Its totient is φ = 132948.

The previous prime is 199429. The next prime is 199447. The reversal of 199431 is 134991.

It is not a de Polignac number, because 199431 - 2¹ = 199429 is a prime.

It is a super-2 number, since 2×199431² = 79545447522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199395 and 199404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11071 + ... + 11088.

2¹⁹⁹⁴³¹ is an apocalyptic number.

199431 is a deficient number, since it is larger than the sum of its proper divisors (88649).

199431 is a wasteful number, since it uses less digits than its factorization.

199431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22165 (or 22162 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 199431 is about 446.5769810458. The cubic root of 199431 is about 58.4248432177.

It can be divided in two parts, 1994 and 31, that added together give a square (2025 = 45²).

The spelling of 199431 in words is "one hundred ninety-nine thousand, four hundred thirty-one".