289316981 has 2 divisors, whose sum is σ = 289316982. Its totient is φ = 289316980.

The previous prime is 289316969. The next prime is 289317053. The reversal of 289316981 is 189613982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266668900 + 22648081 = 16330^2 + 4759^2 .

It is a cyclic number.

It is not a de Polignac number, because 289316981 - 2⁶ = 289316917 is a prime.

It is a super-2 number, since 2×289316981² = 167408630989908722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289316581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144658490 + 144658491.

It is an arithmetic number, because the mean of its divisors is an integer number (144658491).

Almost surely, 2^289316981 is an apocalyptic number.

It is an amenable number.

289316981 is a deficient number, since it is larger than the sum of its proper divisors (1).

289316981 is an equidigital number, since it uses as much as digits as its factorization.

289316981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 289316981 is about 17009.3204155839. The cubic root of 289316981 is about 661.3905339864.

The spelling of 289316981 in words is "two hundred eighty-nine million, three hundred sixteen thousand, nine hundred eighty-one".