63815971 has 2 divisors, whose sum is σ = 63815972. Its totient is φ = 63815970.

The previous prime is 63815953. The next prime is 63815981. The reversal of 63815971 is 17951836.

63815971 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 63815971 - 2¹¹ = 63813923 is a prime.

It is not a weakly prime, because it can be changed into another prime (63815911) 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, 31907985 + 31907986.

It is an arithmetic number, because the mean of its divisors is an integer number (31907986).

Almost surely, 2^63815971 is an apocalyptic number.

63815971 is a deficient number, since it is larger than the sum of its proper divisors (1).

63815971 is an equidigital number, since it uses as much as digits as its factorization.

63815971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 63815971 is about 7988.4899073605. The cubic root of 63815971 is about 399.6162381849.

The spelling of 63815971 in words is "sixty-three million, eight hundred fifteen thousand, nine hundred seventy-one".