199986431 has 2 divisors, whose sum is σ = 199986432. Its totient is φ = 199986430.

The previous prime is 199986337. The next prime is 199986439. The reversal of 199986431 is 134689991.

It is a strong prime.

It is an emirp because it is prime and its reverse (134689991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199986431 - 2¹⁴ = 199970047 is a prime.

It is a super-2 number, since 2×199986431² = 79989145168235522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199986431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199986439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99993215 + 99993216.

It is an arithmetic number, because the mean of its divisors is an integer number (99993216).

Almost surely, 2^199986431 is an apocalyptic number.

199986431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199986431 is an equidigital number, since it uses as much as digits as its factorization.

199986431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 199986431 is about 14141.6558789980. The cubic root of 199986431 is about 584.7903220112.

The spelling of 199986431 in words is "one hundred ninety-nine million, nine hundred eighty-six thousand, four hundred thirty-one".