64548581 has 2 divisors, whose sum is σ = 64548582. Its totient is φ = 64548580.

The previous prime is 64548563. The next prime is 64548587. The reversal of 64548581 is 18584546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 1600225 = 7934^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 64548581 - 2¹⁰ = 64547557 is a prime.

It is a super-2 number, since 2×64548581² = 8333038618227122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64548587) 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, 32274290 + 32274291.

It is an arithmetic number, because the mean of its divisors is an integer number (32274291).

Almost surely, 2^64548581 is an apocalyptic number.

It is an amenable number.

64548581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64548581 is an equidigital number, since it uses as much as digits as its factorization.

64548581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153600, while the sum is 41.

The square root of 64548581 is about 8034.2131537569. The cubic root of 64548581 is about 401.1396271249.

The spelling of 64548581 in words is "sixty-four million, five hundred forty-eight thousand, five hundred eighty-one".