64921859 has 2 divisors, whose sum is σ = 64921860. Its totient is φ = 64921858.

The previous prime is 64921811. The next prime is 64921907. The reversal of 64921859 is 95812946.

64921859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (64921811) and next prime (64921907).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64921859 is a prime.

It is not a weakly prime, because it can be changed into another prime (64971859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32460929 + 32460930.

It is an arithmetic number, because the mean of its divisors is an integer number (32460930).

Almost surely, 2^64921859 is an apocalyptic number.

64921859 is a deficient number, since it is larger than the sum of its proper divisors (1).

64921859 is an equidigital number, since it uses as much as digits as its factorization.

64921859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 64921859 is about 8057.4101918669. The cubic root of 64921859 is about 401.9113914916.

The spelling of 64921859 in words is "sixty-four million, nine hundred twenty-one thousand, eight hundred fifty-nine".