1251287 has 2 divisors, whose sum is σ = 1251288. Its totient is φ = 1251286.

The previous prime is 1251259. The next prime is 1251301. The reversal of 1251287 is 7821521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251227) 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, 625643 + 625644.

It is an arithmetic number, because the mean of its divisors is an integer number (625644).

2^1251287 is an apocalyptic number.

1251287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251287 is an equidigital number, since it uses as much as digits as its factorization.

1251287 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1251287 is about 1118.6094045734. The cubic root of 1251287 is about 107.7586919200.

The spelling of 1251287 in words is "one million, two hundred fifty-one thousand, two hundred eighty-seven".