64444231 has 2 divisors, whose sum is σ = 64444232. Its totient is φ = 64444230.

The previous prime is 64444213. The next prime is 64444267. The reversal of 64444231 is 13244446.

Together with previous prime (64444213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64444231 - 2⁷ = 64444103 is a prime.

It is a super-2 number, since 2×64444231² = 8306117818362722, 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 64444231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64444201) 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, 32222115 + 32222116.

It is an arithmetic number, because the mean of its divisors is an integer number (32222116).

Almost surely, 2^64444231 is an apocalyptic number.

64444231 is a deficient number, since it is larger than the sum of its proper divisors (1).

64444231 is an equidigital number, since it uses as much as digits as its factorization.

64444231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 28.

The square root of 64444231 is about 8027.7164249866. The cubic root of 64444231 is about 400.9233481803.

Adding to 64444231 its reverse (13244446), we get a palindrome (77688677).

The spelling of 64444231 in words is "sixty-four million, four hundred forty-four thousand, two hundred thirty-one".