1297534391 has 2 divisors, whose sum is σ = 1297534392. Its totient is φ = 1297534390.

The previous prime is 1297534387. The next prime is 1297534409. The reversal of 1297534391 is 1934357921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1297534391 - 2² = 1297534387 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297534321) 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, 648767195 + 648767196.

It is an arithmetic number, because the mean of its divisors is an integer number (648767196).

Almost surely, 2^1297534391 is an apocalyptic number.

1297534391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297534391 is an equidigital number, since it uses as much as digits as its factorization.

1297534391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 1297534391 is about 36021.3046820906. The cubic root of 1297534391 is about 1090.7024596900.

The spelling of 1297534391 in words is "one billion, two hundred ninety-seven million, five hundred thirty-four thousand, three hundred ninety-one".