64385891 has 2 divisors, whose sum is σ = 64385892. Its totient is φ = 64385890.

The previous prime is 64385879. The next prime is 64385897. The reversal of 64385891 is 19858346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64385891 is a prime.

It is not a weakly prime, because it can be changed into another prime (64385897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32192945 + 32192946.

It is an arithmetic number, because the mean of its divisors is an integer number (32192946).

Almost surely, 2^64385891 is an apocalyptic number.

64385891 is a deficient number, since it is larger than the sum of its proper divisors (1).

64385891 is an equidigital number, since it uses as much as digits as its factorization.

64385891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 64385891 is about 8024.0819412566. The cubic root of 64385891 is about 400.8023291771.

The spelling of 64385891 in words is "sixty-four million, three hundred eighty-five thousand, eight hundred ninety-one".