612209 has 4 divisors (see below), whose sum is σ = 659316. Its totient is φ = 565104.

The previous prime is 612193. The next prime is 612217. The reversal of 612209 is 902216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 418609 + 193600 = 647^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 612209 - 2⁴ = 612193 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 612209.

It is not an unprimeable number, because it can be changed into a prime (612229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23534 + ... + 23559.

It is an arithmetic number, because the mean of its divisors is an integer number (164829).

2⁶¹²²⁰⁹ is an apocalyptic number.

It is an amenable number.

612209 is a deficient number, since it is larger than the sum of its proper divisors (47107).

612209 is a wasteful number, since it uses less digits than its factorization.

612209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47106.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 612209 is about 782.4378569573. The cubic root of 612209 is about 84.9115111406.

The spelling of 612209 in words is "six hundred twelve thousand, two hundred nine".