51280121 has 2 divisors, whose sum is σ = 51280122. Its totient is φ = 51280120.

The previous prime is 51280067. The next prime is 51280147. The reversal of 51280121 is 12108215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 2768896 = 6965^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 51280121 - 2⁶ = 51280057 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51280093 and 51280102.

It is not a weakly prime, because it can be changed into another prime (51280181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25640060 + 25640061.

It is an arithmetic number, because the mean of its divisors is an integer number (25640061).

Almost surely, 2^51280121 is an apocalyptic number.

It is an amenable number.

51280121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51280121 is an equidigital number, since it uses as much as digits as its factorization.

51280121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 51280121 is about 7161.0139645165. The cubic root of 51280121 is about 371.5206977944.

Adding to 51280121 its reverse (12108215), we get a palindrome (63388336).

The spelling of 51280121 in words is "fifty-one million, two hundred eighty thousand, one hundred twenty-one".