521435489 has 2 divisors, whose sum is σ = 521435490. Its totient is φ = 521435488.

The previous prime is 521435377. The next prime is 521435491. The reversal of 521435489 is 984534125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449779264 + 71656225 = 21208^2 + 8465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521435489 is a prime.

It is a Sophie Germain prime.

Together with 521435491, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (521435989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260717744 + 260717745.

It is an arithmetic number, because the mean of its divisors is an integer number (260717745).

Almost surely, 2^521435489 is an apocalyptic number.

It is an amenable number.

521435489 is a deficient number, since it is larger than the sum of its proper divisors (1).

521435489 is an equidigital number, since it uses as much as digits as its factorization.

521435489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 41.

The square root of 521435489 is about 22834.9619881444. The cubic root of 521435489 is about 804.8844343702.

The spelling of 521435489 in words is "five hundred twenty-one million, four hundred thirty-five thousand, four hundred eighty-nine".