191210297 has 2 divisors, whose sum is σ = 191210298. Its totient is φ = 191210296.

The previous prime is 191210251. The next prime is 191210309. The reversal of 191210297 is 792012191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172685881 + 18524416 = 13141^2 + 4304^2 .

It is an emirp because it is prime and its reverse (792012191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191210297 - 2⁶ = 191210233 is a prime.

It is a super-2 number, since 2×191210297² = 73122755357656418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191210197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95605148 + 95605149.

It is an arithmetic number, because the mean of its divisors is an integer number (95605149).

Almost surely, 2^191210297 is an apocalyptic number.

It is an amenable number.

191210297 is a deficient number, since it is larger than the sum of its proper divisors (1).

191210297 is an equidigital number, since it uses as much as digits as its factorization.

191210297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 191210297 is about 13827.8811464374. The cubic root of 191210297 is about 576.1078045792.

The spelling of 191210297 in words is "one hundred ninety-one million, two hundred ten thousand, two hundred ninety-seven".