51233521 has 2 divisors, whose sum is σ = 51233522. Its totient is φ = 51233520.

The previous prime is 51233513. The next prime is 51233531. The reversal of 51233521 is 12533215.

51233521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34093921 + 17139600 = 5839^2 + 4140^2 .

It is a cyclic number.

It is not a de Polignac number, because 51233521 - 2³ = 51233513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51233492 and 51233501.

It is not a weakly prime, because it can be changed into another prime (51233531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25616760 + 25616761.

It is an arithmetic number, because the mean of its divisors is an integer number (25616761).

Almost surely, 2^51233521 is an apocalyptic number.

It is an amenable number.

51233521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51233521 is an equidigital number, since it uses as much as digits as its factorization.

51233521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 22.

The square root of 51233521 is about 7157.7594958199. The cubic root of 51233521 is about 371.4081258329.

Adding to 51233521 its reverse (12533215), we get a palindrome (63766736).

The spelling of 51233521 in words is "fifty-one million, two hundred thirty-three thousand, five hundred twenty-one".