51632321 has 8 divisors (see below), whose sum is σ = 55889064. Its totient is φ = 47416320.

The previous prime is 51632303. The next prime is 51632323. The reversal of 51632321 is 12323615.

It can be written as a sum of positive squares in 4 ways, for example, as 16289296 + 35343025 = 4036^2 + 5945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51632321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51632323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7520 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (6986133).

Almost surely, 2^51632321 is an apocalyptic number.

It is an amenable number.

51632321 is a deficient number, since it is larger than the sum of its proper divisors (4256743).

51632321 is a wasteful number, since it uses less digits than its factorization.

51632321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371.

The product of its digits is 1080, while the sum is 23.

The square root of 51632321 is about 7185.5633738768. The cubic root of 51632321 is about 372.3693122920.

Adding to 51632321 its reverse (12323615), we get a palindrome (63955936).

The spelling of 51632321 in words is "fifty-one million, six hundred thirty-two thousand, three hundred twenty-one".