64216541 has 4 divisors (see below), whose sum is σ = 64377084. Its totient is φ = 64056000.

The previous prime is 64216513. The next prime is 64216543. The reversal of 64216541 is 14561246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52852900 + 11363641 = 7270^2 + 3371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64216541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64216543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79670 + ... + 80471.

It is an arithmetic number, because the mean of its divisors is an integer number (16094271).

Almost surely, 2^64216541 is an apocalyptic number.

It is an amenable number.

64216541 is a deficient number, since it is larger than the sum of its proper divisors (160543).

64216541 is a wasteful number, since it uses less digits than its factorization.

64216541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160542.

The product of its digits is 5760, while the sum is 29.

The square root of 64216541 is about 8013.5223840706. The cubic root of 64216541 is about 400.4506192484.

Adding to 64216541 its reverse (14561246), we get a palindrome (78777787).

The spelling of 64216541 in words is "sixty-four million, two hundred sixteen thousand, five hundred forty-one".