191334427717 has 2 divisors, whose sum is σ = 191334427718. Its totient is φ = 191334427716.

The previous prime is 191334427649. The next prime is 191334427721. The reversal of 191334427717 is 717724433191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108500407236 + 82834020481 = 329394^2 + 287809^2 .

It is a cyclic number.

It is not a de Polignac number, because 191334427717 - 2²⁷ = 191200209989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191334427217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95667213858 + 95667213859.

It is an arithmetic number, because the mean of its divisors is an integer number (95667213859).

Almost surely, 2^191334427717 is an apocalyptic number.

It is an amenable number.

191334427717 is a deficient number, since it is larger than the sum of its proper divisors (1).

191334427717 is an equidigital number, since it uses as much as digits as its factorization.

191334427717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The spelling of 191334427717 in words is "one hundred ninety-one billion, three hundred thirty-four million, four hundred twenty-seven thousand, seven hundred seventeen".