199709712439 has 2 divisors, whose sum is σ = 199709712440. Its totient is φ = 199709712438.

The previous prime is 199709712359. The next prime is 199709712451. The reversal of 199709712439 is 934217907991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199709712439 - 2⁷ = 199709712311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199709712469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99854856219 + 99854856220.

It is an arithmetic number, because the mean of its divisors is an integer number (99854856220).

Almost surely, 2^199709712439 is an apocalyptic number.

199709712439 is a deficient number, since it is larger than the sum of its proper divisors (1).

199709712439 is an equidigital number, since it uses as much as digits as its factorization.

199709712439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7715736, while the sum is 61.

The spelling of 199709712439 in words is "one hundred ninety-nine billion, seven hundred nine million, seven hundred twelve thousand, four hundred thirty-nine".