191306742769 has 2 divisors, whose sum is σ = 191306742770. Its totient is φ = 191306742768.

The previous prime is 191306742761. The next prime is 191306742811. The reversal of 191306742769 is 967247603191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136205283600 + 55101459169 = 369060^2 + 234737^2 .

It is a cyclic number.

It is not a de Polignac number, because 191306742769 - 2³ = 191306742761 is a prime.

It is a super-2 number, since 2×191306742769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191306742761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95653371384 + 95653371385.

It is an arithmetic number, because the mean of its divisors is an integer number (95653371385).

Almost surely, 2^191306742769 is an apocalyptic number.

It is an amenable number.

191306742769 is a deficient number, since it is larger than the sum of its proper divisors (1).

191306742769 is an equidigital number, since it uses as much as digits as its factorization.

191306742769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 191306742769 in words is "one hundred ninety-one billion, three hundred six million, seven hundred forty-two thousand, seven hundred sixty-nine".