209122 has 4 divisors (see below), whose sum is σ = 313686. Its totient is φ = 104560.

The previous prime is 209089. The next prime is 209123. The reversal of 209122 is 221902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221902 = 2 ⋅110951.

It can be written as a sum of positive squares in only one way, i.e., 194481 + 14641 = 441^2 + 121^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209096 and 209105.

It is not an unprimeable number, because it can be changed into a prime (209123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52279 + ... + 52282.

2²⁰⁹¹²² is an apocalyptic number.

209122 is a deficient number, since it is larger than the sum of its proper divisors (104564).

209122 is a wasteful number, since it uses less digits than its factorization.

209122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104563.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 209122 is about 457.2985895452. The cubic root of 209122 is about 59.3562662967.

The spelling of 209122 in words is "two hundred nine thousand, one hundred twenty-two".