1297343191 has 2 divisors, whose sum is σ = 1297343192. Its totient is φ = 1297343190.

The previous prime is 1297343189. The next prime is 1297343213. The reversal of 1297343191 is 1913437921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1297343191 - 2¹ = 1297343189 is a prime.

Together with 1297343189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297343111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648671595 + 648671596.

It is an arithmetic number, because the mean of its divisors is an integer number (648671596).

Almost surely, 2^1297343191 is an apocalyptic number.

1297343191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297343191 is an equidigital number, since it uses as much as digits as its factorization.

1297343191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 1297343191 is about 36018.6505993770. The cubic root of 1297343191 is about 1090.6488830614.

The spelling of 1297343191 in words is "one billion, two hundred ninety-seven million, three hundred forty-three thousand, one hundred ninety-one".