63921859 has 2 divisors, whose sum is σ = 63921860. Its totient is φ = 63921858.

The previous prime is 63921841. The next prime is 63921881. The reversal of 63921859 is 95812936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63921859 - 2⁵ = 63921827 is a prime.

It is not a weakly prime, because it can be changed into another prime (63921889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31960929 + 31960930.

It is an arithmetic number, because the mean of its divisors is an integer number (31960930).

Almost surely, 2^63921859 is an apocalyptic number.

63921859 is a deficient number, since it is larger than the sum of its proper divisors (1).

63921859 is an equidigital number, since it uses as much as digits as its factorization.

63921859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 63921859 is about 7995.1146958627. The cubic root of 63921859 is about 399.8371399505.

The spelling of 63921859 in words is "sixty-three million, nine hundred twenty-one thousand, eight hundred fifty-nine".