289089421 has 2 divisors, whose sum is σ = 289089422. Its totient is φ = 289089420.

The previous prime is 289089407. The next prime is 289089443. The reversal of 289089421 is 124980982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284293321 + 4796100 = 16861^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 289089421 - 2⁷ = 289089293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289089481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144544710 + 144544711.

It is an arithmetic number, because the mean of its divisors is an integer number (144544711).

Almost surely, 2^289089421 is an apocalyptic number.

It is an amenable number.

289089421 is a deficient number, since it is larger than the sum of its proper divisors (1).

289089421 is an equidigital number, since it uses as much as digits as its factorization.

289089421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 289089421 is about 17002.6298260004. The cubic root of 289089421 is about 661.2170846594.

The spelling of 289089421 in words is "two hundred eighty-nine million, eighty-nine thousand, four hundred twenty-one".