2251209 has 8 divisors (see below), whose sum is σ = 3038112. Its totient is φ = 1482560.

The previous prime is 2251201. The next prime is 2251211. The reversal of 2251209 is 9021522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2251209 - 2³ = 2251201 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2251201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4272 + ... + 4769.

It is an arithmetic number, because the mean of its divisors is an integer number (379764).

2^2251209 is an apocalyptic number.

It is an amenable number.

2251209 is a deficient number, since it is larger than the sum of its proper divisors (786903).

2251209 is an equidigital number, since it uses as much as digits as its factorization.

2251209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127.

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

The square root of 2251209 is about 1500.4029458782. The cubic root of 2251209 is about 131.0605357031.

The spelling of 2251209 in words is "two million, two hundred fifty-one thousand, two hundred nine".