205689122 has 4 divisors (see below), whose sum is σ = 308533686. Its totient is φ = 102844560.

The previous prime is 205689109. The next prime is 205689149. The reversal of 205689122 is 221986502.

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: 221986502 = 2 ⋅110993251.

It can be written as a sum of positive squares in only one way, i.e., 128618281 + 77070841 = 11341^2 + 8779^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51422279 + ... + 51422282.

Almost surely, 2^205689122 is an apocalyptic number.

205689122 is a deficient number, since it is larger than the sum of its proper divisors (102844564).

205689122 is a wasteful number, since it uses less digits than its factorization.

205689122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102844563.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 205689122 is about 14341.8660571071. The cubic root of 205689122 is about 590.2968170413.

The spelling of 205689122 in words is "two hundred five million, six hundred eighty-nine thousand, one hundred twenty-two".