193897143312991 has 2 divisors, whose sum is σ = 193897143312992. Its totient is φ = 193897143312990.

The previous prime is 193897143312937. The next prime is 193897143313001. The reversal of 193897143312991 is 199213341798391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 193897143312991 - 2⁷ = 193897143312863 is a prime.

It is a super-2 number, since 2×193897143312991² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 193897143312991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193897143312091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96948571656495 + 96948571656496.

It is an arithmetic number, because the mean of its divisors is an integer number (96948571656496).

Almost surely, 2^{193897143312991} is an apocalyptic number.

193897143312991 is a deficient number, since it is larger than the sum of its proper divisors (1).

193897143312991 is an equidigital number, since it uses as much as digits as its factorization.

193897143312991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 70.

The spelling of 193897143312991 in words is "one hundred ninety-three trillion, eight hundred ninety-seven billion, one hundred forty-three million, three hundred twelve thousand, nine hundred ninety-one".