1297657 has 2 divisors, whose sum is σ = 1297658. Its totient is φ = 1297656.

The previous prime is 1297651. The next prime is 1297669. The reversal of 1297657 is 7567921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 18496 = 1131^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297657 - 2³ = 1297649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1297651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648828 + 648829.

It is an arithmetic number, because the mean of its divisors is an integer number (648829).

2^1297657 is an apocalyptic number.

It is an amenable number.

1297657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297657 is an equidigital number, since it uses as much as digits as its factorization.

1297657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 1297657 is about 1139.1474882560. The cubic root of 1297657 is about 109.0736813494.

The spelling of 1297657 in words is "one million, two hundred ninety-seven thousand, six hundred fifty-seven".