65609321 has 4 divisors (see below), whose sum is σ = 67005312. Its totient is φ = 64213332.

The previous prime is 65609311. The next prime is 65609329. The reversal of 65609321 is 12390656.

It is a happy number.

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 65609321 - 2²² = 61415017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65609329) 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, 697925 + ... + 698018.

It is an arithmetic number, because the mean of its divisors is an integer number (16751328).

Almost surely, 2^65609321 is an apocalyptic number.

It is an amenable number.

65609321 is a deficient number, since it is larger than the sum of its proper divisors (1395991).

65609321 is a wasteful number, since it uses less digits than its factorization.

65609321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395990.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 65609321 is about 8099.9580863113. The cubic root of 65609321 is about 403.3250358393.

Adding to 65609321 its reverse (12390656), we get a palindrome (77999977).

The spelling of 65609321 in words is "sixty-five million, six hundred nine thousand, three hundred twenty-one".