191011097 has 2 divisors, whose sum is σ = 191011098. Its totient is φ = 191011096.

The previous prime is 191011063. The next prime is 191011109. The reversal of 191011097 is 790110191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173738761 + 17272336 = 13181^2 + 4156^2 .

It is a cyclic number.

It is not a de Polignac number, because 191011097 - 2⁶ = 191011033 is a prime.

It is not a weakly prime, because it can be changed into another prime (191011027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95505548 + 95505549.

It is an arithmetic number, because the mean of its divisors is an integer number (95505549).

Almost surely, 2^191011097 is an apocalyptic number.

It is an amenable number.

191011097 is a deficient number, since it is larger than the sum of its proper divisors (1).

191011097 is an equidigital number, since it uses as much as digits as its factorization.

191011097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 191011097 is about 13820.6764306238. The cubic root of 191011097 is about 575.9076749287.

The spelling of 191011097 in words is "one hundred ninety-one million, eleven thousand, ninety-seven".