64621 has 2 divisors, whose sum is σ = 64622.
Its totient is φ = 64620.
The previous prime is 64613. The next prime is 64627. The reversal of 64621 is 12646.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 35721 + 28900 = 189^2 + 170^2
It is a cyclic number.
It is not a de Polignac number, because 64621 - 23 = 64613 is a prime.
It is a pancake number, because a pancake can be divided into 64621 parts by 359 straight cuts.
It is equal to p6463 and since 64621 and 6463 have the same sum of digits, it is a Honaker prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (64627) 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 as a sum of consecutive naturals, namely, 32310 + 32311.
It is an arithmetic number, because the mean of its divisors is an integer number (32311).
264621 is an apocalyptic number.
It is an amenable number.
64621 is a deficient number, since it is larger than the sum of its proper divisors (1).
64621 is an equidigital number, since it uses as much as digits as its factorization.
64621 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 288, while the sum is 19.
The square root of 64621 is about 254.2066088834.
The cubic root of 64621 is about 40.1289587939.
The spelling of 64621 in words is "sixty-four thousand, six hundred twenty-one".