63954809 has 2 divisors, whose sum is σ = 63954810. Its totient is φ = 63954808.

The previous prime is 63954791. The next prime is 63954811. The reversal of 63954809 is 90845936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 1149184 = 7925^2 + 1072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63954809 is a prime.

Together with 63954811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63954809.

It is not a weakly prime, because it can be changed into another prime (63954899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31977404 + 31977405.

It is an arithmetic number, because the mean of its divisors is an integer number (31977405).

Almost surely, 2^63954809 is an apocalyptic number.

It is an amenable number.

63954809 is a deficient number, since it is larger than the sum of its proper divisors (1).

63954809 is an equidigital number, since it uses as much as digits as its factorization.

63954809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 63954809 is about 7997.1750637334. The cubic root of 63954809 is about 399.9058299151.

The spelling of 63954809 in words is "sixty-three million, nine hundred fifty-four thousand, eight hundred nine".