289190921 has 2 divisors, whose sum is σ = 289190922. Its totient is φ = 289190920.

The previous prime is 289190879. The next prime is 289190939. The reversal of 289190921 is 129091982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239135296 + 50055625 = 15464^2 + 7075^2 .

It is a cyclic number.

It is not a de Polignac number, because 289190921 - 2¹⁴ = 289174537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (289192921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144595460 + 144595461.

It is an arithmetic number, because the mean of its divisors is an integer number (144595461).

Almost surely, 2^289190921 is an apocalyptic number.

It is an amenable number.

289190921 is a deficient number, since it is larger than the sum of its proper divisors (1).

289190921 is an equidigital number, since it uses as much as digits as its factorization.

289190921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 289190921 is about 17005.6143964280. The cubic root of 289190921 is about 661.2944605809.

The spelling of 289190921 in words is "two hundred eighty-nine million, one hundred ninety thousand, nine hundred twenty-one".