199794431 has 2 divisors, whose sum is σ = 199794432. Its totient is φ = 199794430.

The previous prime is 199794407. The next prime is 199794437. The reversal of 199794431 is 134497991.

It is a strong prime.

It is an emirp because it is prime and its reverse (134497991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199794431 - 2²² = 195600127 is a prime.

It is a super-2 number, since 2×199794431² = 79835629317227522, 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 (199794437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99897215 + 99897216.

It is an arithmetic number, because the mean of its divisors is an integer number (99897216).

Almost surely, 2^199794431 is an apocalyptic number.

199794431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199794431 is an equidigital number, since it uses as much as digits as its factorization.

199794431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 199794431 is about 14134.8657934909. The cubic root of 199794431 is about 584.6031164887.

The spelling of 199794431 in words is "one hundred ninety-nine million, seven hundred ninety-four thousand, four hundred thirty-one".