191910097 has 2 divisors, whose sum is σ = 191910098. Its totient is φ = 191910096.

The previous prime is 191910079. The next prime is 191910109. The reversal of 191910097 is 790019191.

Together with previous prime (191910079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174345616 + 17564481 = 13204^2 + 4191^2 .

It is a cyclic number.

It is not a de Polignac number, because 191910097 - 2⁷ = 191909969 is a prime.

It is not a weakly prime, because it can be changed into another prime (191910007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95955048 + 95955049.

It is an arithmetic number, because the mean of its divisors is an integer number (95955049).

Almost surely, 2^191910097 is an apocalyptic number.

It is an amenable number.

191910097 is a deficient number, since it is larger than the sum of its proper divisors (1).

191910097 is an equidigital number, since it uses as much as digits as its factorization.

191910097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 191910097 is about 13853.1619856262. The cubic root of 191910097 is about 576.8097706186.

The spelling of 191910097 in words is "one hundred ninety-one million, nine hundred ten thousand, ninety-seven".