191010109091 has 2 divisors, whose sum is σ = 191010109092. Its totient is φ = 191010109090.

The previous prime is 191010109079. The next prime is 191010109159. The reversal of 191010109091 is 190901010191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191010109091 is a prime.

It is not a weakly prime, because it can be changed into another prime (191010109001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95505054545 + 95505054546.

It is an arithmetic number, because the mean of its divisors is an integer number (95505054546).

Almost surely, 2^191010109091 is an apocalyptic number.

191010109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

191010109091 is an equidigital number, since it uses as much as digits as its factorization.

191010109091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 32.

The spelling of 191010109091 in words is "one hundred ninety-one billion, ten million, one hundred nine thousand, ninety-one".