289600021 has 2 divisors, whose sum is σ = 289600022. Its totient is φ = 289600020.

The previous prime is 289600019. The next prime is 289600079. The reversal of 289600021 is 120006982.

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., 285948100 + 3651921 = 16910^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 289600021 - 2¹ = 289600019 is a prime.

Together with 289600019, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_15719041 and since 289600021 and 15719041 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289600081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144800010 + 144800011.

It is an arithmetic number, because the mean of its divisors is an integer number (144800011).

Almost surely, 2^289600021 is an apocalyptic number.

It is an amenable number.

289600021 is a deficient number, since it is larger than the sum of its proper divisors (1).

289600021 is an equidigital number, since it uses as much as digits as its factorization.

289600021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 289600021 is about 17017.6385259530. The cubic root of 289600021 is about 661.6061440566.

The spelling of 289600021 in words is "two hundred eighty-nine million, six hundred thousand, twenty-one".