64518191 has 2 divisors, whose sum is σ = 64518192. Its totient is φ = 64518190.

The previous prime is 64518187. The next prime is 64518239. The reversal of 64518191 is 19181546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64518191 - 2² = 64518187 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64518131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32259095 + 32259096.

It is an arithmetic number, because the mean of its divisors is an integer number (32259096).

Almost surely, 2^64518191 is an apocalyptic number.

64518191 is a deficient number, since it is larger than the sum of its proper divisors (1).

64518191 is an equidigital number, since it uses as much as digits as its factorization.

64518191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 64518191 is about 8032.3216444562. The cubic root of 64518191 is about 401.0766639699.

The spelling of 64518191 in words is "sixty-four million, five hundred eighteen thousand, one hundred ninety-one".