51054221 has 2 divisors, whose sum is σ = 51054222. Its totient is φ = 51054220.

The previous prime is 51054169. The next prime is 51054233. The reversal of 51054221 is 12245015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 8934121 = 6490^2 + 2989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51054221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51054193 and 51054202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51054251) 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 as a sum of consecutive naturals, namely, 25527110 + 25527111.

It is an arithmetic number, because the mean of its divisors is an integer number (25527111).

Almost surely, 2^51054221 is an apocalyptic number.

It is an amenable number.

51054221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51054221 is an equidigital number, since it uses as much as digits as its factorization.

51054221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51054221 is about 7145.2236494038. The cubic root of 51054221 is about 370.9743517989.

Adding to 51054221 its reverse (12245015), we get a palindrome (63299236).

The spelling of 51054221 in words is "fifty-one million, fifty-four thousand, two hundred twenty-one".