289641209 has 12 divisors (see below), whose sum is σ = 342857508. Its totient is φ = 243054240.

The previous prime is 289641203. The next prime is 289641211. The reversal of 289641209 is 902146982.

It can be written as a sum of positive squares in 2 ways, for example, as 135955600 + 153685609 = 11660^2 + 12397^2 .

It is not a de Polignac number, because 289641209 - 2⁴ = 289641193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289641203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90494 + ... + 93639.

It is an arithmetic number, because the mean of its divisors is an integer number (28571459).

Almost surely, 2^289641209 is an apocalyptic number.

It is an amenable number.

289641209 is a deficient number, since it is larger than the sum of its proper divisors (53216299).

289641209 is a wasteful number, since it uses less digits than its factorization.

289641209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184168 (or 184157 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 289641209 is about 17018.8486390825. The cubic root of 289641209 is about 661.6375079379.

The spelling of 289641209 in words is "two hundred eighty-nine million, six hundred forty-one thousand, two hundred nine".