64891 has 2 divisors, whose sum is σ = 64892. Its totient is φ = 64890.

The previous prime is 64879. The next prime is 64901. The reversal of 64891 is 19846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64891 - 2⁷ = 64763 is a prime.

64891 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (64811) 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, 32445 + 32446.

It is an arithmetic number, because the mean of its divisors is an integer number (32446).

2⁶⁴⁸⁹¹ is an apocalyptic number.

64891 is a deficient number, since it is larger than the sum of its proper divisors (1).

64891 is an equidigital number, since it uses as much as digits as its factorization.

64891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 64891 is about 254.7371193996. The cubic root of 64891 is about 40.1847701853.

The spelling of 64891 in words is "sixty-four thousand, eight hundred ninety-one".