191050989601 has 2 divisors, whose sum is σ = 191050989602. Its totient is φ = 191050989600.

The previous prime is 191050989599. The next prime is 191050989667. The reversal of 191050989601 is 106989050191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103539150625 + 87511838976 = 321775^2 + 295824^2 .

It is an emirp because it is prime and its reverse (106989050191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191050989601 - 2¹ = 191050989599 is a prime.

Together with 191050989599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (191050189601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95525494800 + 95525494801.

It is an arithmetic number, because the mean of its divisors is an integer number (95525494801).

Almost surely, 2^191050989601 is an apocalyptic number.

It is an amenable number.

191050989601 is a deficient number, since it is larger than the sum of its proper divisors (1).

191050989601 is an equidigital number, since it uses as much as digits as its factorization.

191050989601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 49.

The spelling of 191050989601 in words is "one hundred ninety-one billion, fifty million, nine hundred eighty-nine thousand, six hundred one".