51303521 has 2 divisors, whose sum is σ = 51303522. Its totient is φ = 51303520.

The previous prime is 51303503. The next prime is 51303529. The reversal of 51303521 is 12530315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37650496 + 13653025 = 6136^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 51303521 - 2⁶ = 51303457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51303493 and 51303502.

It is not a weakly prime, because it can be changed into another prime (51303529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25651760 + 25651761.

It is an arithmetic number, because the mean of its divisors is an integer number (25651761).

Almost surely, 2^51303521 is an apocalyptic number.

It is an amenable number.

51303521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51303521 is an equidigital number, since it uses as much as digits as its factorization.

51303521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 51303521 is about 7162.6476250057. The cubic root of 51303521 is about 371.5771996263.

Adding to 51303521 its reverse (12530315), we get a palindrome (63833836).

The spelling of 51303521 in words is "fifty-one million, three hundred three thousand, five hundred twenty-one".