51202621 has 2 divisors, whose sum is σ = 51202622. Its totient is φ = 51202620.

The previous prime is 51202609. The next prime is 51202631. The reversal of 51202621 is 12620215.

51202621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44756100 + 6446521 = 6690^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 51202621 - 2⁷ = 51202493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51202631) 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, 25601310 + 25601311.

It is an arithmetic number, because the mean of its divisors is an integer number (25601311).

Almost surely, 2^51202621 is an apocalyptic number.

It is an amenable number.

51202621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51202621 is an equidigital number, since it uses as much as digits as its factorization.

51202621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51202621 is about 7155.6006735983. The cubic root of 51202621 is about 371.3334428332. Note that the first 3 decimals are identical.

Adding to 51202621 its reverse (12620215), we get a palindrome (63822836).

The spelling of 51202621 in words is "fifty-one million, two hundred two thousand, six hundred twenty-one".