191001622397 has 2 divisors, whose sum is σ = 191001622398. Its totient is φ = 191001622396.

The previous prime is 191001622393. The next prime is 191001622421. The reversal of 191001622397 is 793226100191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190924428601 + 77193796 = 436949^2 + 8786^2 .

It is a cyclic number.

It is not a de Polignac number, because 191001622397 - 2² = 191001622393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191001622391) 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, 95500811198 + 95500811199.

It is an arithmetic number, because the mean of its divisors is an integer number (95500811199).

Almost surely, 2^191001622397 is an apocalyptic number.

It is an amenable number.

191001622397 is a deficient number, since it is larger than the sum of its proper divisors (1).

191001622397 is an equidigital number, since it uses as much as digits as its factorization.

191001622397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 191001622397 in words is "one hundred ninety-one billion, one million, six hundred twenty-two thousand, three hundred ninety-seven".