64940243 has 2 divisors, whose sum is σ = 64940244. Its totient is φ = 64940242.

The previous prime is 64940209. The next prime is 64940263. The reversal of 64940243 is 34204946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64940243 - 2¹⁶ = 64874707 is a prime.

It is a Chen prime.

It is equal to p_3837227 and since 64940243 and 3837227 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64940263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32470121 + 32470122.

It is an arithmetic number, because the mean of its divisors is an integer number (32470122).

Almost surely, 2^64940243 is an apocalyptic number.

64940243 is a deficient number, since it is larger than the sum of its proper divisors (1).

64940243 is an equidigital number, since it uses as much as digits as its factorization.

64940243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 64940243 is about 8058.5509243288. The cubic root of 64940243 is about 401.9493244868.

The spelling of 64940243 in words is "sixty-four million, nine hundred forty thousand, two hundred forty-three".