64841891 has 2 divisors, whose sum is σ = 64841892. Its totient is φ = 64841890.

The previous prime is 64841873. The next prime is 64841911. The reversal of 64841891 is 19814846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64841891 - 2¹⁴ = 64825507 is a prime.

It is not a weakly prime, because it can be changed into another prime (64841191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32420945 + 32420946.

It is an arithmetic number, because the mean of its divisors is an integer number (32420946).

Almost surely, 2^64841891 is an apocalyptic number.

64841891 is a deficient number, since it is larger than the sum of its proper divisors (1).

64841891 is an equidigital number, since it uses as much as digits as its factorization.

64841891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 64841891 is about 8052.4462742697. The cubic root of 64841891 is about 401.7463045397.

The spelling of 64841891 in words is "sixty-four million, eight hundred forty-one thousand, eight hundred ninety-one".