289694381 has 2 divisors, whose sum is σ = 289694382. Its totient is φ = 289694380.

The previous prime is 289694347. The next prime is 289694437. The reversal of 289694381 is 183496982.

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., 287980900 + 1713481 = 16970^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 289694381 - 2¹⁸ = 289432237 is a prime.

It is a super-2 number, since 2×289694381² = 167845668765946322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289694681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144847190 + 144847191.

It is an arithmetic number, because the mean of its divisors is an integer number (144847191).

Almost surely, 2^289694381 is an apocalyptic number.

It is an amenable number.

289694381 is a deficient number, since it is larger than the sum of its proper divisors (1).

289694381 is an equidigital number, since it uses as much as digits as its factorization.

289694381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 289694381 is about 17020.4107177236. The cubic root of 289694381 is about 661.6779930115.

The spelling of 289694381 in words is "two hundred eighty-nine million, six hundred ninety-four thousand, three hundred eighty-one".