289619881 has 2 divisors, whose sum is σ = 289619882. Its totient is φ = 289619880.

The previous prime is 289619879. The next prime is 289619903. The reversal of 289619881 is 188916982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289544256 + 75625 = 17016^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 289619881 - 2¹ = 289619879 is a prime.

It is a super-2 number, since 2×289619881² = 167759350940908322, which contains 22 as substring.

Together with 289619879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (289619801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144809940 + 144809941.

It is an arithmetic number, because the mean of its divisors is an integer number (144809941).

Almost surely, 2^289619881 is an apocalyptic number.

It is an amenable number.

289619881 is a deficient number, since it is larger than the sum of its proper divisors (1).

289619881 is an equidigital number, since it uses as much as digits as its factorization.

289619881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 52.

The square root of 289619881 is about 17018.2220281673. Note that the first 3 decimals coincide. The cubic root of 289619881 is about 661.6212674414.

The spelling of 289619881 in words is "two hundred eighty-nine million, six hundred nineteen thousand, eight hundred eighty-one".