221064539 has 2 divisors, whose sum is σ = 221064540. Its totient is φ = 221064538.

The previous prime is 221064517. The next prime is 221064541. The reversal of 221064539 is 935460122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221064539 - 2¹⁶ = 220999003 is a prime.

Together with 221064541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221964539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110532269 + 110532270.

It is an arithmetic number, because the mean of its divisors is an integer number (110532270).

Almost surely, 2^221064539 is an apocalyptic number.

221064539 is a deficient number, since it is larger than the sum of its proper divisors (1).

221064539 is an equidigital number, since it uses as much as digits as its factorization.

221064539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 221064539 is about 14868.2392703373. The cubic root of 221064539 is about 604.6532074408.

The spelling of 221064539 in words is "two hundred twenty-one million, sixty-four thousand, five hundred thirty-nine".