1297649 has 2 divisors, whose sum is σ = 1297650. Its totient is φ = 1297648.

The previous prime is 1297633. The next prime is 1297651. The reversal of 1297649 is 9467921.

1297649 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868624 + 429025 = 932^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297649 - 2⁴ = 1297633 is a prime.

Together with 1297651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1297619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648824 + 648825.

It is an arithmetic number, because the mean of its divisors is an integer number (648825).

2^1297649 is an apocalyptic number.

It is an amenable number.

1297649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297649 is an equidigital number, since it uses as much as digits as its factorization.

1297649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 1297649 is about 1139.1439768528. The cubic root of 1297649 is about 109.0734572041.

It can be divided in two parts, 1297 and 649, that multiplied together give a triangular number (841753 = T₁₂₉₇).

The spelling of 1297649 in words is "one million, two hundred ninety-seven thousand, six hundred forty-nine".