1297651 has 2 divisors, whose sum is σ = 1297652. Its totient is φ = 1297650.

The previous prime is 1297649. The next prime is 1297657. The reversal of 1297651 is 1567921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1297651 - 2¹ = 1297649 is a prime.

Together with 1297649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1297657) 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, 648825 + 648826.

It is an arithmetic number, because the mean of its divisors is an integer number (648826).

2^1297651 is an apocalyptic number.

1297651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297651 is an equidigital number, since it uses as much as digits as its factorization.

1297651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 1297651 is about 1139.1448547046. The cubic root of 1297651 is about 109.0735132405.

The spelling of 1297651 in words is "one million, two hundred ninety-seven thousand, six hundred fifty-one".