64651271 has 4 divisors (see below), whose sum is σ = 64757352. Its totient is φ = 64545192.

The previous prime is 64651267. The next prime is 64651283. The reversal of 64651271 is 17215646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64651271 - 2² = 64651267 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64651201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52121 + ... + 53346.

It is an arithmetic number, because the mean of its divisors is an integer number (16189338).

Almost surely, 2^64651271 is an apocalyptic number.

64651271 is a deficient number, since it is larger than the sum of its proper divisors (106081).

64651271 is a wasteful number, since it uses less digits than its factorization.

64651271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106080.

The product of its digits is 10080, while the sum is 32.

The square root of 64651271 is about 8040.6014078550. The cubic root of 64651271 is about 401.3522380626.

The spelling of 64651271 in words is "sixty-four million, six hundred fifty-one thousand, two hundred seventy-one".