289165381 has 2 divisors, whose sum is σ = 289165382. Its totient is φ = 289165380.

The previous prime is 289165369. The next prime is 289165391. The reversal of 289165381 is 183561982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282744225 + 6421156 = 16815^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 289165381 - 2¹⁷ = 289034309 is a prime.

It is a super-2 number, since 2×289165381² = 167233235137750322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289165391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144582690 + 144582691.

It is an arithmetic number, because the mean of its divisors is an integer number (144582691).

Almost surely, 2^289165381 is an apocalyptic number.

It is an amenable number.

289165381 is a deficient number, since it is larger than the sum of its proper divisors (1).

289165381 is an equidigital number, since it uses as much as digits as its factorization.

289165381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 289165381 is about 17004.8634513777. The cubic root of 289165381 is about 661.2749925219.

The spelling of 289165381 in words is "two hundred eighty-nine million, one hundred sixty-five thousand, three hundred eighty-one".