289550261 has 72 divisors (see below), whose sum is σ = 418394592. Its totient is φ = 196862400.

The previous prime is 289550251. The next prime is 289550263. The reversal of 289550261 is 162055982.

It is not a de Polignac number, because 289550261 - 2¹⁰ = 289549237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289550263) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6733706 + ... + 6733748.

It is an arithmetic number, because the mean of its divisors is an integer number (5811036).

Almost surely, 2^289550261 is an apocalyptic number.

It is an amenable number.

289550261 is a deficient number, since it is larger than the sum of its proper divisors (128844331).

289550261 is a wasteful number, since it uses less digits than its factorization.

289550261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 289550261 is about 17016.1764506601. The cubic root of 289550261 is about 661.5682487929.

The spelling of 289550261 in words is "two hundred eighty-nine million, five hundred fifty thousand, two hundred sixty-one".