289850021 has 2 divisors, whose sum is σ = 289850022. Its totient is φ = 289850020.

The previous prime is 289850009. The next prime is 289850039. The reversal of 289850021 is 120058982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174609796 + 115240225 = 13214^2 + 10735^2 .

It is a cyclic number.

It is not a de Polignac number, because 289850021 - 2¹⁴ = 289833637 is a prime.

It is a super-3 number, since 3×289850021³ (a number of 26 digits) contains 333 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 (289850321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144925010 + 144925011.

It is an arithmetic number, because the mean of its divisors is an integer number (144925011).

Almost surely, 2^289850021 is an apocalyptic number.

It is an amenable number.

289850021 is a deficient number, since it is larger than the sum of its proper divisors (1).

289850021 is an equidigital number, since it uses as much as digits as its factorization.

289850021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 289850021 is about 17024.9822613711. The cubic root of 289850021 is about 661.7964685870.

The spelling of 289850021 in words is "two hundred eighty-nine million, eight hundred fifty thousand, twenty-one".