191688495241 has 2 divisors, whose sum is σ = 191688495242. Its totient is φ = 191688495240.

The previous prime is 191688495209. The next prime is 191688495247. The reversal of 191688495241 is 142594886191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188981478400 + 2707016841 = 434720^2 + 52029^2 .

It is a cyclic number.

It is not a de Polignac number, because 191688495241 - 2⁵ = 191688495209 is a prime.

It is not a weakly prime, because it can be changed into another prime (191688495247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95844247620 + 95844247621.

It is an arithmetic number, because the mean of its divisors is an integer number (95844247621).

Almost surely, 2^191688495241 is an apocalyptic number.

It is an amenable number.

191688495241 is a deficient number, since it is larger than the sum of its proper divisors (1).

191688495241 is an equidigital number, since it uses as much as digits as its factorization.

191688495241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 58.

The spelling of 191688495241 in words is "one hundred ninety-one billion, six hundred eighty-eight million, four hundred ninety-five thousand, two hundred forty-one".