51065221 has 8 divisors (see below), whose sum is σ = 53380800. Its totient is φ = 48757632.

The previous prime is 51065177. The next prime is 51065233. The reversal of 51065221 is 12256015.

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

It is a cyclic number.

It is not a de Polignac number, because 51065221 - 2⁹ = 51064709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51065192 and 51065201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51065281) 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 7 ways as a sum of consecutive naturals, for example, 13830 + ... + 17128.

It is an arithmetic number, because the mean of its divisors is an integer number (6672600).

Almost surely, 2^51065221 is an apocalyptic number.

It is an amenable number.

51065221 is a deficient number, since it is larger than the sum of its proper divisors (2315579).

51065221 is a wasteful number, since it uses less digits than its factorization.

51065221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51065221 is about 7145.9933529216. The cubic root of 51065221 is about 371.0009929185. Note that the first 3 decimals are identical.

The spelling of 51065221 in words is "fifty-one million, sixty-five thousand, two hundred twenty-one".