63521251 has 2 divisors, whose sum is σ = 63521252. Its totient is φ = 63521250.

The previous prime is 63521243. The next prime is 63521257. The reversal of 63521251 is 15212536.

63521251 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 is a cyclic number.

It is not a de Polignac number, because 63521251 - 2³ = 63521243 is a prime.

It is not a weakly prime, because it can be changed into another prime (63521257) 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, 31760625 + 31760626.

It is an arithmetic number, because the mean of its divisors is an integer number (31760626).

Almost surely, 2^63521251 is an apocalyptic number.

63521251 is a deficient number, since it is larger than the sum of its proper divisors (1).

63521251 is an equidigital number, since it uses as much as digits as its factorization.

63521251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 63521251 is about 7970.0220200449. The cubic root of 63521251 is about 399.0001088770. Note that the first 3 decimals are identical.

Adding to 63521251 its reverse (15212536), we get a palindrome (78733787).

The spelling of 63521251 in words is "sixty-three million, five hundred twenty-one thousand, two hundred fifty-one".