65003521 has 4 divisors (see below), whose sum is σ = 70912944. Its totient is φ = 59094100.

The previous prime is 65003473. The next prime is 65003551. The reversal of 65003521 is 12530056.

It is a happy number.

65003521 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65003521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65003492 and 65003501.

It is not an unprimeable number, because it can be changed into a prime (65003551) 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 3 ways as a sum of consecutive naturals, for example, 2954695 + ... + 2954716.

It is an arithmetic number, because the mean of its divisors is an integer number (17728236).

It is a Proth number, since it is equal to 7935 ⋅ 2¹³ + 1 and 7935 < 2¹³.

Almost surely, 2^65003521 is an apocalyptic number.

It is an amenable number.

65003521 is a deficient number, since it is larger than the sum of its proper divisors (5909423).

65003521 is a wasteful number, since it uses less digits than its factorization.

65003521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5909422.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 65003521 is about 8062.4761084917. The cubic root of 65003521 is about 402.0798357152.

Adding to 65003521 its reverse (12530056), we get a palindrome (77533577).

It can be divided in two parts, 650035 and 21, that added together give a palindrome (650056).

The spelling of 65003521 in words is "sixty-five million, three thousand, five hundred twenty-one".