1225687 has 2 divisors, whose sum is σ = 1225688. Its totient is φ = 1225686.

The previous prime is 1225663. The next prime is 1225691. The reversal of 1225687 is 7865221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225687 - 2⁷ = 1225559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225657) 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, 612843 + 612844.

It is an arithmetic number, because the mean of its divisors is an integer number (612844).

2^1225687 is an apocalyptic number.

1225687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225687 is an equidigital number, since it uses as much as digits as its factorization.

1225687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 1225687 is about 1107.1074925227. The cubic root of 1225687 is about 107.0187465334.

The spelling of 1225687 in words is "one million, two hundred twenty-five thousand, six hundred eighty-seven".