51335521 has 2 divisors, whose sum is σ = 51335522. Its totient is φ = 51335520.

The previous prime is 51335519. The next prime is 51335533. The reversal of 51335521 is 12553315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 1081600 = 7089^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 51335521 - 2¹ = 51335519 is a prime.

Together with 51335519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51335551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25667760 + 25667761.

It is an arithmetic number, because the mean of its divisors is an integer number (25667761).

Almost surely, 2^51335521 is an apocalyptic number.

It is an amenable number.

51335521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51335521 is an equidigital number, since it uses as much as digits as its factorization.

51335521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 25.

The square root of 51335521 is about 7164.8810876385. The cubic root of 51335521 is about 371.6544392831.

Adding to 51335521 its reverse (12553315), we get a palindrome (63888836).

The spelling of 51335521 in words is "fifty-one million, three hundred thirty-five thousand, five hundred twenty-one".