63540641 has 2 divisors, whose sum is σ = 63540642. Its totient is φ = 63540640.

The previous prime is 63540637. The next prime is 63540643. The reversal of 63540641 is 14604536.

It is a happy number.

63540641 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., 38390416 + 25150225 = 6196^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 63540641 - 2² = 63540637 is a prime.

Together with 63540643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63540643) 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, 31770320 + 31770321.

It is an arithmetic number, because the mean of its divisors is an integer number (31770321).

Almost surely, 2^63540641 is an apocalyptic number.

It is an amenable number.

63540641 is a deficient number, since it is larger than the sum of its proper divisors (1).

63540641 is an equidigital number, since it uses as much as digits as its factorization.

63540641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 63540641 is about 7971.2383605059. The cubic root of 63540641 is about 399.0407032971.

The spelling of 63540641 in words is "sixty-three million, five hundred forty thousand, six hundred forty-one".