51560221 has 2 divisors, whose sum is σ = 51560222. Its totient is φ = 51560220.

The previous prime is 51560153. The next prime is 51560233. The reversal of 51560221 is 12206515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51408900 + 151321 = 7170^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 51560221 - 2¹¹ = 51558173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51560192 and 51560201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51560251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25780110 + 25780111.

It is an arithmetic number, because the mean of its divisors is an integer number (25780111).

Almost surely, 2^51560221 is an apocalyptic number.

It is an amenable number.

51560221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51560221 is an equidigital number, since it uses as much as digits as its factorization.

51560221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51560221 is about 7180.5446172279. The cubic root of 51560221 is about 372.1959045409.

Adding to 51560221 its reverse (12206515), we get a palindrome (63766736).

The spelling of 51560221 in words is "fifty-one million, five hundred sixty thousand, two hundred twenty-one".