1297004491 has 2 divisors, whose sum is σ = 1297004492. Its totient is φ = 1297004490.

The previous prime is 1297004473. The next prime is 1297004503. The reversal of 1297004491 is 1944007921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297004491 - 2¹⁵ = 1296971723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297004491.

It is not a weakly prime, because it can be changed into another prime (1297004461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648502245 + 648502246.

It is an arithmetic number, because the mean of its divisors is an integer number (648502246).

Almost surely, 2^1297004491 is an apocalyptic number.

1297004491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297004491 is an equidigital number, since it uses as much as digits as its factorization.

1297004491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1297004491 is about 36013.9485616337. The cubic root of 1297004491 is about 1090.5539621670.

The spelling of 1297004491 in words is "one billion, two hundred ninety-seven million, four thousand, four hundred ninety-one".