289748521 has 2 divisors, whose sum is σ = 289748522. Its totient is φ = 289748520.

The previous prime is 289748477. The next prime is 289748533. The reversal of 289748521 is 125847982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289680400 + 68121 = 17020^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 289748521 - 2⁹ = 289748009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (289748581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144874260 + 144874261.

It is an arithmetic number, because the mean of its divisors is an integer number (144874261).

Almost surely, 2^289748521 is an apocalyptic number.

It is an amenable number.

289748521 is a deficient number, since it is larger than the sum of its proper divisors (1).

289748521 is an equidigital number, since it uses as much as digits as its factorization.

289748521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 289748521 is about 17022.0010868288. The cubic root of 289748521 is about 661.7192100291.

The spelling of 289748521 in words is "two hundred eighty-nine million, seven hundred forty-eight thousand, five hundred twenty-one".