191022090971 has 2 divisors, whose sum is σ = 191022090972. Its totient is φ = 191022090970.

The previous prime is 191022090943. The next prime is 191022091021. The reversal of 191022090971 is 179090220191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191022090971 is a prime.

It is not a weakly prime, because it can be changed into another prime (191022090071) 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, 95511045485 + 95511045486.

It is an arithmetic number, because the mean of its divisors is an integer number (95511045486).

Almost surely, 2^191022090971 is an apocalyptic number.

191022090971 is a deficient number, since it is larger than the sum of its proper divisors (1).

191022090971 is an equidigital number, since it uses as much as digits as its factorization.

191022090971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 41.

The spelling of 191022090971 in words is "one hundred ninety-one billion, twenty-two million, ninety thousand, nine hundred seventy-one".