451209 has 16 divisors (see below), whose sum is σ = 667584. Its totient is φ = 271040.

The previous prime is 451207. The next prime is 451249. The reversal of 451209 is 902154.

It is not a de Polignac number, because 451209 - 2¹ = 451207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (451201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3937 + ... + 4049.

It is an arithmetic number, because the mean of its divisors is an integer number (41724).

2⁴⁵¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

451209 is a deficient number, since it is larger than the sum of its proper divisors (216375).

451209 is a wasteful number, since it uses less digits than its factorization.

451209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 451209 is about 671.7209241940. The cubic root of 451209 is about 76.6995091383.

The spelling of 451209 in words is "four hundred fifty-one thousand, two hundred nine".