64221481 has 2 divisors, whose sum is σ = 64221482. Its totient is φ = 64221480.

The previous prime is 64221433. The next prime is 64221541. The reversal of 64221481 is 18412246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33872400 + 30349081 = 5820^2 + 5509^2 .

It is a cyclic number.

It is not a de Polignac number, because 64221481 - 2¹⁵ = 64188713 is a prime.

It is a super-2 number, since 2×64221481² = 8248797243666722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64221431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110740 + 32110741.

It is an arithmetic number, because the mean of its divisors is an integer number (32110741).

Almost surely, 2^64221481 is an apocalyptic number.

It is an amenable number.

64221481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64221481 is an equidigital number, since it uses as much as digits as its factorization.

64221481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 28.

The square root of 64221481 is about 8013.8306071441. The cubic root of 64221481 is about 400.4608875028.

The spelling of 64221481 in words is "sixty-four million, two hundred twenty-one thousand, four hundred eighty-one".