64471439 has 2 divisors, whose sum is σ = 64471440. Its totient is φ = 64471438.

The previous prime is 64471417. The next prime is 64471441. The reversal of 64471439 is 93417446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64471439 - 2¹⁶ = 64405903 is a prime.

Together with 64471441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64471409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32235719 + 32235720.

It is an arithmetic number, because the mean of its divisors is an integer number (32235720).

Almost surely, 2^64471439 is an apocalyptic number.

64471439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64471439 is an equidigital number, since it uses as much as digits as its factorization.

64471439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 64471439 is about 8029.4108750269. The cubic root of 64471439 is about 400.9797627861.

The spelling of 64471439 in words is "sixty-four million, four hundred seventy-one thousand, four hundred thirty-nine".