64381231 has 2 divisors, whose sum is σ = 64381232. Its totient is φ = 64381230.

The previous prime is 64381223. The next prime is 64381237. The reversal of 64381231 is 13218346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64381231 - 2³ = 64381223 is a prime.

It is a super-2 number, since 2×64381231² = 8289885810150722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64381231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64381237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32190615 + 32190616.

It is an arithmetic number, because the mean of its divisors is an integer number (32190616).

Almost surely, 2^64381231 is an apocalyptic number.

64381231 is a deficient number, since it is larger than the sum of its proper divisors (1).

64381231 is an equidigital number, since it uses as much as digits as its factorization.

64381231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 64381231 is about 8023.7915601042. The cubic root of 64381231 is about 400.7926594400.

Adding to 64381231 its reverse (13218346), we get a palindrome (77599577).

The spelling of 64381231 in words is "sixty-four million, three hundred eighty-one thousand, two hundred thirty-one".