289537921 has 2 divisors, whose sum is σ = 289537922. Its totient is φ = 289537920.

The previous prime is 289537909. The next prime is 289537981. The reversal of 289537921 is 129735982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265331521 + 24206400 = 16289^2 + 4920^2 .

It is a cyclic number.

It is not a de Polignac number, because 289537921 - 2²⁵ = 255983489 is a prime.

It is not a weakly prime, because it can be changed into another prime (289537981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144768960 + 144768961.

It is an arithmetic number, because the mean of its divisors is an integer number (144768961).

Almost surely, 2^289537921 is an apocalyptic number.

It is an amenable number.

289537921 is a deficient number, since it is larger than the sum of its proper divisors (1).

289537921 is an equidigital number, since it uses as much as digits as its factorization.

289537921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 289537921 is about 17015.8138506508. The cubic root of 289537921 is about 661.5588504612.

The spelling of 289537921 in words is "two hundred eighty-nine million, five hundred thirty-seven thousand, nine hundred twenty-one".