64971321 has 16 divisors (see below), whose sum is σ = 88058880. Its totient is φ = 42603920.

The previous prime is 64971299. The next prime is 64971329. The reversal of 64971321 is 12317946.

It is a cyclic number.

It is not a de Polignac number, because 64971321 - 2⁵ = 64971289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64971329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77020 + ... + 77858.

It is an arithmetic number, because the mean of its divisors is an integer number (5503680).

Almost surely, 2^64971321 is an apocalyptic number.

It is an amenable number.

64971321 is a deficient number, since it is larger than the sum of its proper divisors (23087559).

64971321 is a wasteful number, since it uses less digits than its factorization.

64971321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236.

The product of its digits is 9072, while the sum is 33.

The square root of 64971321 is about 8060.4789559926. The cubic root of 64971321 is about 402.0134336245.

The spelling of 64971321 in words is "sixty-four million, nine hundred seventy-one thousand, three hundred twenty-one".