64519813 has 2 divisors, whose sum is σ = 64519814. Its totient is φ = 64519812.

The previous prime is 64519789. The next prime is 64519817. The reversal of 64519813 is 31891546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54420129 + 10099684 = 7377^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 64519813 - 2⁵ = 64519781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64519817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32259906 + 32259907.

It is an arithmetic number, because the mean of its divisors is an integer number (32259907).

Almost surely, 2^64519813 is an apocalyptic number.

It is an amenable number.

64519813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64519813 is an equidigital number, since it uses as much as digits as its factorization.

64519813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 64519813 is about 8032.4226108939. The cubic root of 64519813 is about 401.0800249905.

The spelling of 64519813 in words is "sixty-four million, five hundred nineteen thousand, eight hundred thirteen".