64021543 has 2 divisors, whose sum is σ = 64021544. Its totient is φ = 64021542.

The previous prime is 64021501. The next prime is 64021553. The reversal of 64021543 is 34512046.

64021543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64021543 - 2¹³ = 64013351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64021553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32010771 + 32010772.

It is an arithmetic number, because the mean of its divisors is an integer number (32010772).

Almost surely, 2^64021543 is an apocalyptic number.

64021543 is a deficient number, since it is larger than the sum of its proper divisors (1).

64021543 is an equidigital number, since it uses as much as digits as its factorization.

64021543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64021543 is about 8001.3463242132. The cubic root of 64021543 is about 400.0448762151.

Adding to 64021543 its reverse (34512046), we get a palindrome (98533589).

The spelling of 64021543 in words is "sixty-four million, twenty-one thousand, five hundred forty-three".