191039659439 has 2 divisors, whose sum is σ = 191039659440. Its totient is φ = 191039659438.

The previous prime is 191039659409. The next prime is 191039659451. The reversal of 191039659439 is 934956930191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191039659439 - 2⁸ = 191039659183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191039659409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95519829719 + 95519829720.

It is an arithmetic number, because the mean of its divisors is an integer number (95519829720).

Almost surely, 2^191039659439 is an apocalyptic number.

191039659439 is a deficient number, since it is larger than the sum of its proper divisors (1).

191039659439 is an equidigital number, since it uses as much as digits as its factorization.

191039659439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7085880, while the sum is 59.

The spelling of 191039659439 in words is "one hundred ninety-one billion, thirty-nine million, six hundred fifty-nine thousand, four hundred thirty-nine".