1256257 has 4 divisors (see below), whose sum is σ = 1273540. Its totient is φ = 1238976.

The previous prime is 1256243. The next prime is 1256267. The reversal of 1256257 is 7526521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 614656 = 801^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256257 - 2¹⁵ = 1223489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8532 + ... + 8677.

It is an arithmetic number, because the mean of its divisors is an integer number (318385).

2^1256257 is an apocalyptic number.

It is an amenable number.

1256257 is a deficient number, since it is larger than the sum of its proper divisors (17283).

1256257 is an equidigital number, since it uses as much as digits as its factorization.

1256257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17282.

The product of its digits is 4200, while the sum is 28.

The square root of 1256257 is about 1120.8287112668. The cubic root of 1256257 is about 107.9011727399.

The spelling of 1256257 in words is "one million, two hundred fifty-six thousand, two hundred fifty-seven".