64397243 has 2 divisors, whose sum is σ = 64397244. Its totient is φ = 64397242.

The previous prime is 64397189. The next prime is 64397257. The reversal of 64397243 is 34279346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64397243 - 2²² = 60202939 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 64397197 and 64397206.

It is not a weakly prime, because it can be changed into another prime (64297243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32198621 + 32198622.

It is an arithmetic number, because the mean of its divisors is an integer number (32198622).

Almost surely, 2^64397243 is an apocalyptic number.

64397243 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397243 is an equidigital number, since it uses as much as digits as its factorization.

64397243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The square root of 64397243 is about 8024.7892807226. The cubic root of 64397243 is about 400.8258832021.

The spelling of 64397243 in words is "sixty-four million, three hundred ninety-seven thousand, two hundred forty-three".