64813897 has 2 divisors, whose sum is σ = 64813898. Its totient is φ = 64813896.

The previous prime is 64813867. The next prime is 64813913. The reversal of 64813897 is 79831846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35176761 + 29637136 = 5931^2 + 5444^2 .

It is a cyclic number.

It is not a de Polignac number, because 64813897 - 2¹¹ = 64811849 is a prime.

It is not a weakly prime, because it can be changed into another prime (64813867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406948 + 32406949.

It is an arithmetic number, because the mean of its divisors is an integer number (32406949).

Almost surely, 2^64813897 is an apocalyptic number.

It is an amenable number.

64813897 is a deficient number, since it is larger than the sum of its proper divisors (1).

64813897 is an equidigital number, since it uses as much as digits as its factorization.

64813897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 64813897 is about 8050.7078570769. The cubic root of 64813897 is about 401.6884812985.

The spelling of 64813897 in words is "sixty-four million, eight hundred thirteen thousand, eight hundred ninety-seven".