289901609 has 2 divisors, whose sum is σ = 289901610. Its totient is φ = 289901608.

The previous prime is 289901587. The next prime is 289901699. The reversal of 289901609 is 906109982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218448400 + 71453209 = 14780^2 + 8453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289901609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 289901609.

It is not a weakly prime, because it can be changed into another prime (289901699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144950804 + 144950805.

It is an arithmetic number, because the mean of its divisors is an integer number (144950805).

Almost surely, 2^289901609 is an apocalyptic number.

It is an amenable number.

289901609 is a deficient number, since it is larger than the sum of its proper divisors (1).

289901609 is an equidigital number, since it uses as much as digits as its factorization.

289901609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 289901609 is about 17026.4972616214. The cubic root of 289901609 is about 661.8357288118.

The spelling of 289901609 in words is "two hundred eighty-nine million, nine hundred one thousand, six hundred nine".