64517071 has 4 divisors (see below), whose sum is σ = 66017512. Its totient is φ = 63016632.

The previous prime is 64517069. The next prime is 64517081. The reversal of 64517071 is 17071546.

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 64517071 - 2¹ = 64517069 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 (64517021) 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 in 3 ways as a sum of consecutive naturals, for example, 750156 + ... + 750241.

It is an arithmetic number, because the mean of its divisors is an integer number (16504378).

Almost surely, 2^64517071 is an apocalyptic number.

64517071 is a deficient number, since it is larger than the sum of its proper divisors (1500441).

64517071 is a wasteful number, since it uses less digits than its factorization.

64517071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500440.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 64517071 is about 8032.2519258300. The cubic root of 64517071 is about 401.0743431337.

The spelling of 64517071 in words is "sixty-four million, five hundred seventeen thousand, seventy-one".