63905081 has 2 divisors, whose sum is σ = 63905082. Its totient is φ = 63905080.

The previous prime is 63905077. The next prime is 63905087. The reversal of 63905081 is 18050936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 1731856 = 7885^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 63905081 - 2² = 63905077 is a prime.

It is a super-2 number, since 2×63905081² = 8167718755233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63905087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31952540 + 31952541.

It is an arithmetic number, because the mean of its divisors is an integer number (31952541).

Almost surely, 2^63905081 is an apocalyptic number.

It is an amenable number.

63905081 is a deficient number, since it is larger than the sum of its proper divisors (1).

63905081 is an equidigital number, since it uses as much as digits as its factorization.

63905081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 63905081 is about 7994.0653612539. The cubic root of 63905081 is about 399.8021542421.

The spelling of 63905081 in words is "sixty-three million, nine hundred five thousand, eighty-one".