1312657 has 2 divisors, whose sum is σ = 1312658. Its totient is φ = 1312656.

The previous prime is 1312637. The next prime is 1312667. The reversal of 1312657 is 7562131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 126736 = 1089^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312657 - 2¹⁹ = 788369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656328 + 656329.

It is an arithmetic number, because the mean of its divisors is an integer number (656329).

2^1312657 is an apocalyptic number.

It is an amenable number.

1312657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312657 is an equidigital number, since it uses as much as digits as its factorization.

1312657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 1312657 is about 1145.7124421075. The cubic root of 1312657 is about 109.4923439390.

Adding to 1312657 its reverse (7562131), we get a palindrome (8874788).

The spelling of 1312657 in words is "one million, three hundred twelve thousand, six hundred fifty-seven".