1266589 has 2 divisors, whose sum is σ = 1266590. Its totient is φ = 1266588.

The previous prime is 1266583. The next prime is 1266593. The reversal of 1266589 is 9856621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 195364 = 1035^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266589 - 2⁵ = 1266557 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633294 + 633295.

It is an arithmetic number, because the mean of its divisors is an integer number (633295).

2^1266589 is an apocalyptic number.

It is an amenable number.

1266589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266589 is an equidigital number, since it uses as much as digits as its factorization.

1266589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 1266589 is about 1125.4283628912. The cubic root of 1266589 is about 108.1961740840.

The spelling of 1266589 in words is "one million, two hundred sixty-six thousand, five hundred eighty-nine".