199442431 has 2 divisors, whose sum is σ = 199442432. Its totient is φ = 199442430.

The previous prime is 199442417. The next prime is 199442459. The reversal of 199442431 is 134244991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199442431 - 2⁷ = 199442303 is a prime.

It is a super-2 number, since 2×199442431² = 79554566566379522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199442231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99721215 + 99721216.

It is an arithmetic number, because the mean of its divisors is an integer number (99721216).

Almost surely, 2^199442431 is an apocalyptic number.

199442431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199442431 is an equidigital number, since it uses as much as digits as its factorization.

199442431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 199442431 is about 14122.4088242764. The cubic root of 199442431 is about 584.2595946280.

The spelling of 199442431 in words is "one hundred ninety-nine million, four hundred forty-two thousand, four hundred thirty-one".