209289055 has 8 divisors (see below), whose sum is σ = 251254944. Its totient is φ = 167359200.

The previous prime is 209289053. The next prime is 209289061. The reversal of 209289055 is 550982902.

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

It is not a de Polignac number, because 209289055 - 2¹ = 209289053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209288999 and 209289017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209289053) 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, 6070 + ... + 21340.

It is an arithmetic number, because the mean of its divisors is an integer number (31406868).

Almost surely, 2^209289055 is an apocalyptic number.

209289055 is a deficient number, since it is larger than the sum of its proper divisors (41965889).

209289055 is a wasteful number, since it uses less digits than its factorization.

209289055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18017.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 209289055 is about 14466.8260167875. The cubic root of 209289055 is about 593.7206747474.

The spelling of 209289055 in words is "two hundred nine million, two hundred eighty-nine thousand, fifty-five".