65537221 has 4 divisors (see below), whose sum is σ = 65572192. Its totient is φ = 65502252.

The previous prime is 65537201. The next prime is 65537243. The reversal of 65537221 is 12273556.

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 65537221 - 2⁷ = 65537093 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 (65537201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14505 + ... + 18478.

It is an arithmetic number, because the mean of its divisors is an integer number (16393048).

Almost surely, 2^65537221 is an apocalyptic number.

It is an amenable number.

65537221 is a deficient number, since it is larger than the sum of its proper divisors (34971).

65537221 is a wasteful number, since it uses less digits than its factorization.

65537221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34970.

The product of its digits is 12600, while the sum is 31.

The square root of 65537221 is about 8095.5062225904. The cubic root of 65537221 is about 403.1772397978.

The spelling of 65537221 in words is "sixty-five million, five hundred thirty-seven thousand, two hundred twenty-one".