1055209 has 4 divisors (see below), whose sum is σ = 1089280. Its totient is φ = 1021140.

The previous prime is 1055191. The next prime is 1055231. The reversal of 1055209 is 9025501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9025501 = 73 ⋅123637.

It is a de Polignac number, because none of the positive numbers 2^k-1055209 is a prime.

It is a super-2 number, since 2×1055209² = 2226932067362, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1055209.

It is not an unprimeable number, because it can be changed into a prime (1055269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16989 + ... + 17050.

It is an arithmetic number, because the mean of its divisors is an integer number (272320).

2^1055209 is an apocalyptic number.

It is an amenable number.

1055209 is a deficient number, since it is larger than the sum of its proper divisors (34071).

1055209 is an equidigital number, since it uses as much as digits as its factorization.

1055209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1055209 is about 1027.2336637786. The cubic root of 1055209 is about 101.8074349694.

The spelling of 1055209 in words is "one million, fifty-five thousand, two hundred nine".