64510081 has 2 divisors, whose sum is σ = 64510082. Its totient is φ = 64510080.

The previous prime is 64510051. The next prime is 64510091. The reversal of 64510081 is 18001546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46362481 + 18147600 = 6809^2 + 4260^2 .

It is a cyclic number.

It is not a de Polignac number, because 64510081 - 2⁹ = 64509569 is a prime.

It is a super-2 number, since 2×64510081² = 8323101101253122, which contains 22 as substring.

It is equal to p_3813460 and since 64510081 and 3813460 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64510051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32255040 + 32255041.

It is an arithmetic number, because the mean of its divisors is an integer number (32255041).

Almost surely, 2^64510081 is an apocalyptic number.

It is an amenable number.

64510081 is a deficient number, since it is larger than the sum of its proper divisors (1).

64510081 is an equidigital number, since it uses as much as digits as its factorization.

64510081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 64510081 is about 8031.8167932293. The cubic root of 64510081 is about 401.0598580221.

The spelling of 64510081 in words is "sixty-four million, five hundred ten thousand, eighty-one".