191054341817 has 2 divisors, whose sum is σ = 191054341818. Its totient is φ = 191054341816.

The previous prime is 191054341771. The next prime is 191054341831. The reversal of 191054341817 is 718143450191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149444869561 + 41609472256 = 386581^2 + 203984^2 .

It is a cyclic number.

It is not a de Polignac number, because 191054341817 - 2³⁴ = 173874472633 is a prime.

It is a super-2 number, since 2×191054341817² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191054347817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95527170908 + 95527170909.

It is an arithmetic number, because the mean of its divisors is an integer number (95527170909).

Almost surely, 2^191054341817 is an apocalyptic number.

It is an amenable number.

191054341817 is a deficient number, since it is larger than the sum of its proper divisors (1).

191054341817 is an equidigital number, since it uses as much as digits as its factorization.

191054341817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 191054341817 in words is "one hundred ninety-one billion, fifty-four million, three hundred forty-one thousand, eight hundred seventeen".