199995431 has 2 divisors, whose sum is σ = 199995432. Its totient is φ = 199995430.

The previous prime is 199995401. The next prime is 199995443. The reversal of 199995431 is 134599991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199995431 is a prime.

It is a super-2 number, since 2×199995431² = 79996344841751522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 199995431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199995401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997715 + 99997716.

It is an arithmetic number, because the mean of its divisors is an integer number (99997716).

Almost surely, 2^199995431 is an apocalyptic number.

199995431 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995431 is an equidigital number, since it uses as much as digits as its factorization.

199995431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 50.

The square root of 199995431 is about 14141.9740842642. The cubic root of 199995431 is about 584.7990943296.

The spelling of 199995431 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, four hundred thirty-one".