1071209 has 4 divisors (see below), whose sum is σ = 1073280. Its totient is φ = 1069140.

The previous prime is 1071197. The next prime is 1071223. The reversal of 1071209 is 9021701.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1071209 - 2⁴ = 1071193 is a prime.

It is a super-2 number, since 2×1071209² = 2294977443362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1071229) 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, 512 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (268320).

2^1071209 is an apocalyptic number.

It is an amenable number.

1071209 is a deficient number, since it is larger than the sum of its proper divisors (2071).

1071209 is a wasteful number, since it uses less digits than its factorization.

1071209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 1071209 is about 1034.9922705025. The cubic root of 1071209 is about 102.3194203010.

The spelling of 1071209 in words is "one million, seventy-one thousand, two hundred nine".