1089509 has 2 divisors, whose sum is σ = 1089510. Its totient is φ = 1089508.

The previous prime is 1089503. The next prime is 1089523. The reversal of 1089509 is 9059801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717409 + 372100 = 847^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089509 - 2¹⁶ = 1023973 is a prime.

It is a super-2 number, since 2×1089509² = 2374059722162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544754 + 544755.

It is an arithmetic number, because the mean of its divisors is an integer number (544755).

2^1089509 is an apocalyptic number.

It is an amenable number.

1089509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089509 is an equidigital number, since it uses as much as digits as its factorization.

1089509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1089509 is about 1043.7954780511. The cubic root of 1089509 is about 102.8987914632.

The spelling of 1089509 in words is "one million, eighty-nine thousand, five hundred nine".