64693243 has 2 divisors, whose sum is σ = 64693244. Its totient is φ = 64693242.

The previous prime is 64693217. The next prime is 64693259. The reversal of 64693243 is 34239646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64693243 is a prime.

It is not a weakly prime, because it can be changed into another prime (64690243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32346621 + 32346622.

It is an arithmetic number, because the mean of its divisors is an integer number (32346622).

Almost surely, 2^64693243 is an apocalyptic number.

64693243 is a deficient number, since it is larger than the sum of its proper divisors (1).

64693243 is an equidigital number, since it uses as much as digits as its factorization.

64693243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 37.

The square root of 64693243 is about 8043.2109881564. The cubic root of 64693243 is about 401.4390727155.

The spelling of 64693243 in words is "sixty-four million, six hundred ninety-three thousand, two hundred forty-three".