289772281 has 2 divisors, whose sum is σ = 289772282. Its totient is φ = 289772280.

The previous prime is 289772279. The next prime is 289772291. The reversal of 289772281 is 182277982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277522281 + 12250000 = 16659^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 289772281 - 2¹ = 289772279 is a prime.

It is a super-2 number, since 2×289772281² = 167935949671885922, which contains 22 as substring.

Together with 289772279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (289772291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144886140 + 144886141.

It is an arithmetic number, because the mean of its divisors is an integer number (144886141).

Almost surely, 2^289772281 is an apocalyptic number.

It is an amenable number.

289772281 is a deficient number, since it is larger than the sum of its proper divisors (1).

289772281 is an equidigital number, since it uses as much as digits as its factorization.

289772281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 289772281 is about 17022.6989928154. The cubic root of 289772281 is about 661.7372969994.

The spelling of 289772281 in words is "two hundred eighty-nine million, seven hundred seventy-two thousand, two hundred eighty-one".