63638881 has 2 divisors, whose sum is σ = 63638882. Its totient is φ = 63638880.

The previous prime is 63638879. The next prime is 63638903. The reversal of 63638881 is 18883636.

63638881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46457856 + 17181025 = 6816^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 63638881 - 2¹ = 63638879 is a prime.

It is a super-2 number, since 2×63638881² = 8099814349864322, which contains 22 as substring.

Together with 63638879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63638801) 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, 31819440 + 31819441.

It is an arithmetic number, because the mean of its divisors is an integer number (31819441).

Almost surely, 2^63638881 is an apocalyptic number.

It is an amenable number.

63638881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63638881 is an equidigital number, since it uses as much as digits as its factorization.

63638881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 63638881 is about 7977.3981347304. The cubic root of 63638881 is about 399.2462492918.

The spelling of 63638881 in words is "sixty-three million, six hundred thirty-eight thousand, eight hundred eighty-one".