191214917089793 has 2 divisors, whose sum is σ = 191214917089794. Its totient is φ = 191214917089792.

The previous prime is 191214917089759. The next prime is 191214917089853. The reversal of 191214917089793 is 397980719412191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107790222190849 + 83424694898944 = 10382207^2 + 9133712^2 .

It is a cyclic number.

It is not a de Polignac number, because 191214917089793 - 2³² = 191210622122497 is a prime.

It is a super-2 number, since 2×191214917089793² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191214917085793) 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, 95607458544896 + 95607458544897.

It is an arithmetic number, because the mean of its divisors is an integer number (95607458544897).

Almost surely, 2^{191214917089793} is an apocalyptic number.

It is an amenable number.

191214917089793 is a deficient number, since it is larger than the sum of its proper divisors (1).

191214917089793 is an equidigital number, since it uses as much as digits as its factorization.

191214917089793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61725888, while the sum is 71.

The spelling of 191214917089793 in words is "one hundred ninety-one trillion, two hundred fourteen billion, nine hundred seventeen million, eighty-nine thousand, seven hundred ninety-three".