64643121 has 12 divisors (see below), whose sum is σ = 93724020. Its totient is φ = 42933600.

The previous prime is 64643099. The next prime is 64643171. The reversal of 64643121 is 12134646.

64643121 is a `hidden beast` number, since 6 + 4 + 643 + 12 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4410000 + 60233121 = 2100^2 + 7761^2 .

It is not a de Polignac number, because 64643121 - 2¹⁹ = 64118833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64643171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10930 + ... + 15771.

It is an arithmetic number, because the mean of its divisors is an integer number (7810335).

Almost surely, 2^64643121 is an apocalyptic number.

It is an amenable number.

64643121 is a deficient number, since it is larger than the sum of its proper divisors (29080899).

64643121 is a wasteful number, since it uses less digits than its factorization.

64643121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26976 (or 26973 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 64643121 is about 8040.0945889958. The cubic root of 64643121 is about 401.3353724070.

Adding to 64643121 its reverse (12134646), we get a palindrome (76777767).

The spelling of 64643121 in words is "sixty-four million, six hundred forty-three thousand, one hundred twenty-one".