1258681 has 2 divisors, whose sum is σ = 1258682. Its totient is φ = 1258680.

The previous prime is 1258667. The next prime is 1258709. The reversal of 1258681 is 1868521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 13225 = 1116^2 + 115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1258681 is a prime.

It is a super-2 number, since 2×1258681² = 3168555719522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1258601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629340 + 629341.

It is an arithmetic number, because the mean of its divisors is an integer number (629341).

2^1258681 is an apocalyptic number.

It is an amenable number.

1258681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1258681 is an equidigital number, since it uses as much as digits as its factorization.

1258681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 1258681 is about 1121.9095328947. The cubic root of 1258681 is about 107.9705280807.

The spelling of 1258681 in words is "one million, two hundred fifty-eight thousand, six hundred eighty-one".