51784221 has 8 divisors (see below), whose sum is σ = 69087040. Its totient is φ = 34502112.

The previous prime is 51784217. The next prime is 51784223. The reversal of 51784221 is 12248715.

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

It is not a de Polignac number, because 51784221 - 2² = 51784217 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 (51784223) 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, 2136 + ... + 10398.

It is an arithmetic number, because the mean of its divisors is an integer number (8635880).

Almost surely, 2^51784221 is an apocalyptic number.

It is an amenable number.

51784221 is a deficient number, since it is larger than the sum of its proper divisors (17302819).

51784221 is a wasteful number, since it uses less digits than its factorization.

51784221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10355.

The product of its digits is 4480, while the sum is 30.

The square root of 51784221 is about 7196.1254158054. The cubic root of 51784221 is about 372.7341194477.

The spelling of 51784221 in words is "fifty-one million, seven hundred eighty-four thousand, two hundred twenty-one".