64144081 has 3 divisors (see below), whose sum is σ = 64152091. Its totient is φ = 64136072.

The previous prime is 64144037. The next prime is 64144099. The reversal of 64144081 is 18044146.

The square root of 64144081 is 8009.

It is a perfect power (a square), and thus also a powerful number.

64144081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 22657600 = 6441^2 + 4760^2 .

It is not a de Polignac number, because 64144081 - 2⁷ = 64143953 is a prime.

It is a super-3 number, since 3×64144081³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64144181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4005 + ... + 12013.

Almost surely, 2^64144081 is an apocalyptic number.

64144081 is the 8009-th square number.

64144081 is the 4005-th centered octagonal number.

It is an amenable number.

64144081 is a deficient number, since it is larger than the sum of its proper divisors (8010).

64144081 is an frugal number, since it uses more digits than its factorization.

64144081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16018 (or 8009 counting only the distinct ones).

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

The cubic root of 64144081 is about 400.2999437781.

The spelling of 64144081 in words is "sixty-four million, one hundred forty-four thousand, eighty-one".