1297820219 has 2 divisors, whose sum is σ = 1297820220. Its totient is φ = 1297820218.

The previous prime is 1297820131. The next prime is 1297820243. The reversal of 1297820219 is 9120287921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297820219 - 2²⁰ = 1296771643 is a prime.

It is a super-2 number, since 2×1297820219² = 3368674641690415922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1297820299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648910109 + 648910110.

It is an arithmetic number, because the mean of its divisors is an integer number (648910110).

Almost surely, 2^1297820219 is an apocalyptic number.

1297820219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297820219 is an equidigital number, since it uses as much as digits as its factorization.

1297820219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1297820219 is about 36025.2719490082. The cubic root of 1297820219 is about 1090.7825424521.

The spelling of 1297820219 in words is "one billion, two hundred ninety-seven million, eight hundred twenty thousand, two hundred nineteen".