191620097 has 2 divisors, whose sum is σ = 191620098. Its totient is φ = 191620096.

The previous prime is 191620087. The next prime is 191620103. The reversal of 191620097 is 790026191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120318961 + 71301136 = 10969^2 + 8444^2 .

It is a cyclic number.

It is not a de Polignac number, because 191620097 - 2¹⁰ = 191619073 is a prime.

It is not a weakly prime, because it can be changed into another prime (191620027) 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, 95810048 + 95810049.

It is an arithmetic number, because the mean of its divisors is an integer number (95810049).

Almost surely, 2^191620097 is an apocalyptic number.

It is an amenable number.

191620097 is a deficient number, since it is larger than the sum of its proper divisors (1).

191620097 is an equidigital number, since it uses as much as digits as its factorization.

191620097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 191620097 is about 13842.6911039725. The cubic root of 191620097 is about 576.5190804037.

The spelling of 191620097 in words is "one hundred ninety-one million, six hundred twenty thousand, ninety-seven".