51003521 has 2 divisors, whose sum is σ = 51003522. Its totient is φ = 51003520.

The previous prime is 51003517. The next prime is 51003523. The reversal of 51003521 is 12530015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48720400 + 2283121 = 6980^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 51003521 - 2² = 51003517 is a prime.

Together with 51003523, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51003521.

It is not a weakly prime, because it can be changed into another prime (51003523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25501760 + 25501761.

It is an arithmetic number, because the mean of its divisors is an integer number (25501761).

Almost surely, 2^51003521 is an apocalyptic number.

It is an amenable number.

51003521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51003521 is an equidigital number, since it uses as much as digits as its factorization.

51003521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51003521 is about 7141.6749435969. The cubic root of 51003521 is about 370.8515109663.

Adding to 51003521 its reverse (12530015), we get a palindrome (63533536).

The spelling of 51003521 in words is "fifty-one million, three thousand, five hundred twenty-one".