63805081 has 2 divisors, whose sum is σ = 63805082. Its totient is φ = 63805080.

The previous prime is 63805069. The next prime is 63805109. The reversal of 63805081 is 18050836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46457856 + 17347225 = 6816^2 + 4165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63805081 is a prime.

It is a super-2 number, since 2×63805081² = 8142176722833122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3774208 and since 63805081 and 3774208 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (63808081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31902540 + 31902541.

It is an arithmetic number, because the mean of its divisors is an integer number (31902541).

Almost surely, 2^63805081 is an apocalyptic number.

It is an amenable number.

63805081 is a deficient number, since it is larger than the sum of its proper divisors (1).

63805081 is an equidigital number, since it uses as much as digits as its factorization.

63805081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 63805081 is about 7987.8082726115. The cubic root of 63805081 is about 399.5935057961.

The spelling of 63805081 in words is "sixty-three million, eight hundred five thousand, eighty-one".