289722889 has 2 divisors, whose sum is σ = 289722890. Its totient is φ = 289722888.

The previous prime is 289722877. The next prime is 289722947. The reversal of 289722889 is 988227982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193682889 + 96040000 = 13917^2 + 9800^2 .

It is a cyclic number.

It is not a de Polignac number, because 289722889 - 2⁷ = 289722761 is a prime.

It is not a weakly prime, because it can be changed into another prime (289722859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144861444 + 144861445.

It is an arithmetic number, because the mean of its divisors is an integer number (144861445).

Almost surely, 2^289722889 is an apocalyptic number.

It is an amenable number.

289722889 is a deficient number, since it is larger than the sum of its proper divisors (1).

289722889 is an equidigital number, since it uses as much as digits as its factorization.

289722889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 55.

The square root of 289722889 is about 17021.2481622236. The cubic root of 289722889 is about 661.6996969160.

The spelling of 289722889 in words is "two hundred eighty-nine million, seven hundred twenty-two thousand, eight hundred eighty-nine".