65441521 has 4 divisors (see below), whose sum is σ = 66053232. Its totient is φ = 64829812.

The previous prime is 65441479. The next prime is 65441533. The reversal of 65441521 is 12514456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65441521 - 2⁷ = 65441393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65441521.

It is not an unprimeable number, because it can be changed into a prime (65441581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305695 + ... + 305908.

It is an arithmetic number, because the mean of its divisors is an integer number (16513308).

Almost surely, 2^65441521 is an apocalyptic number.

It is an amenable number.

65441521 is a deficient number, since it is larger than the sum of its proper divisors (611711).

65441521 is a wasteful number, since it uses less digits than its factorization.

65441521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611710.

The product of its digits is 4800, while the sum is 28.

The square root of 65441521 is about 8089.5933766785. The cubic root of 65441521 is about 402.9808991680.

Adding to 65441521 its reverse (12514456), we get a palindrome (77955977).

The spelling of 65441521 in words is "sixty-five million, four hundred forty-one thousand, five hundred twenty-one".