64552921 has 2 divisors, whose sum is σ = 64552922. Its totient is φ = 64552920.

The previous prime is 64552919. The next prime is 64552931. The reversal of 64552921 is 12925546.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33872400 + 30680521 = 5820^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 64552921 - 2¹ = 64552919 is a prime.

Together with 64552919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64552931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32276460 + 32276461.

It is an arithmetic number, because the mean of its divisors is an integer number (32276461).

Almost surely, 2^64552921 is an apocalyptic number.

It is an amenable number.

64552921 is a deficient number, since it is larger than the sum of its proper divisors (1).

64552921 is an equidigital number, since it uses as much as digits as its factorization.

64552921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 64552921 is about 8034.4832441172. The cubic root of 64552921 is about 401.1486172887.

The spelling of 64552921 in words is "sixty-four million, five hundred fifty-two thousand, nine hundred twenty-one".