64971289 has 2 divisors, whose sum is σ = 64971290. Its totient is φ = 64971288.

The previous prime is 64971287. The next prime is 64971293. The reversal of 64971289 is 98217946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 30338064 = 5885^2 + 5508^2 .

It is a cyclic number.

It is not a de Polignac number, because 64971289 - 2¹ = 64971287 is a prime.

Together with 64971287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64971287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32485644 + 32485645.

It is an arithmetic number, because the mean of its divisors is an integer number (32485645).

Almost surely, 2^64971289 is an apocalyptic number.

It is an amenable number.

64971289 is a deficient number, since it is larger than the sum of its proper divisors (1).

64971289 is an equidigital number, since it uses as much as digits as its factorization.

64971289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 64971289 is about 8060.4769709987. The cubic root of 64971289 is about 402.0133676239.

The spelling of 64971289 in words is "sixty-four million, nine hundred seventy-one thousand, two hundred eighty-nine".