63908261 has 2 divisors, whose sum is σ = 63908262. Its totient is φ = 63908260.

The previous prime is 63908239. The next prime is 63908293. The reversal of 63908261 is 16280936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63904036 + 4225 = 7994^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 63908261 - 2⁶ = 63908197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63908161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31954130 + 31954131.

It is an arithmetic number, because the mean of its divisors is an integer number (31954131).

Almost surely, 2^63908261 is an apocalyptic number.

It is an amenable number.

63908261 is a deficient number, since it is larger than the sum of its proper divisors (1).

63908261 is an equidigital number, since it uses as much as digits as its factorization.

63908261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 63908261 is about 7994.2642563278. The cubic root of 63908261 is about 399.8087856906.

The spelling of 63908261 in words is "sixty-three million, nine hundred eight thousand, two hundred sixty-one".