1297534409 has 2 divisors, whose sum is σ = 1297534410. Its totient is φ = 1297534408.

The previous prime is 1297534391. The next prime is 1297534411. The reversal of 1297534409 is 9044357921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278420025 + 19114384 = 35755^2 + 4372^2 .

It is an emirp because it is prime and its reverse (9044357921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1297534409 - 2¹² = 1297530313 is a prime.

Together with 1297534411, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297534409.

It is not a weakly prime, because it can be changed into another prime (1297534429) 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, 648767204 + 648767205.

It is an arithmetic number, because the mean of its divisors is an integer number (648767205).

Almost surely, 2^1297534409 is an apocalyptic number.

It is an amenable number.

1297534409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297534409 is an equidigital number, since it uses as much as digits as its factorization.

1297534409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1297534409 is about 36021.3049319427. The cubic root of 1297534409 is about 1090.7024647336.

The spelling of 1297534409 in words is "one billion, two hundred ninety-seven million, five hundred thirty-four thousand, four hundred nine".