289408621 has 2 divisors, whose sum is σ = 289408622. Its totient is φ = 289408620.

The previous prime is 289408549. The next prime is 289408729. The reversal of 289408621 is 126804982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234855625 + 54552996 = 15325^2 + 7386^2 .

It is a cyclic number.

It is not a de Polignac number, because 289408621 - 2²⁵ = 255854189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289408421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144704310 + 144704311.

It is an arithmetic number, because the mean of its divisors is an integer number (144704311).

Almost surely, 2^289408621 is an apocalyptic number.

It is an amenable number.

289408621 is a deficient number, since it is larger than the sum of its proper divisors (1).

289408621 is an equidigital number, since it uses as much as digits as its factorization.

289408621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 289408621 is about 17012.0140195099. The cubic root of 289408621 is about 661.4603575529.

The spelling of 289408621 in words is "two hundred eighty-nine million, four hundred eight thousand, six hundred twenty-one".