1085509 has 2 divisors, whose sum is σ = 1085510. Its totient is φ = 1085508.

The previous prime is 1085473. The next prime is 1085521. The reversal of 1085509 is 9055801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 280900 = 897^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085509 - 2⁹ = 1084997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542754 + 542755.

It is an arithmetic number, because the mean of its divisors is an integer number (542755).

2^1085509 is an apocalyptic number.

It is an amenable number.

1085509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085509 is an equidigital number, since it uses as much as digits as its factorization.

1085509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1085509 is about 1041.8776319703. The cubic root of 1085509 is about 102.7727102336.

The spelling of 1085509 in words is "one million, eighty-five thousand, five hundred nine".