1257281 has 2 divisors, whose sum is σ = 1257282. Its totient is φ = 1257280.

The previous prime is 1257253. The next prime is 1257293. The reversal of 1257281 is 1827521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 410881 = 920^2 + 641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257281 is a prime.

It is a super-2 number, since 2×1257281² = 3161511025922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1257281.

It is not a weakly prime, because it can be changed into another prime (1257241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628640 + 628641.

It is an arithmetic number, because the mean of its divisors is an integer number (628641).

2^1257281 is an apocalyptic number.

It is an amenable number.

1257281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257281 is an equidigital number, since it uses as much as digits as its factorization.

1257281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

The square root of 1257281 is about 1121.2854230748. The cubic root of 1257281 is about 107.9304822398.

The spelling of 1257281 in words is "one million, two hundred fifty-seven thousand, two hundred eighty-one".