289201921 has 2 divisors, whose sum is σ = 289201922. Its totient is φ = 289201920.

The previous prime is 289201897. The next prime is 289201933. The reversal of 289201921 is 129102982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243828225 + 45373696 = 15615^2 + 6736^2 .

It is a cyclic number.

It is not a de Polignac number, because 289201921 - 2¹⁹ = 288677633 is a prime.

It is a super-2 number, since 2×289201921² = 167275502220180482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (289201621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144600960 + 144600961.

It is an arithmetic number, because the mean of its divisors is an integer number (144600961).

Almost surely, 2^289201921 is an apocalyptic number.

It is an amenable number.

289201921 is a deficient number, since it is larger than the sum of its proper divisors (1).

289201921 is an equidigital number, since it uses as much as digits as its factorization.

289201921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 289201921 is about 17005.9378159512. The cubic root of 289201921 is about 661.3028450613.

The spelling of 289201921 in words is "two hundred eighty-nine million, two hundred one thousand, nine hundred twenty-one".