63959813 has 2 divisors, whose sum is σ = 63959814. Its totient is φ = 63959812.

The previous prime is 63959773. The next prime is 63959821. The reversal of 63959813 is 31895936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34550884 + 29408929 = 5878^2 + 5423^2 .

It is a cyclic number.

It is not a de Polignac number, because 63959813 - 2⁸ = 63959557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63959843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31979906 + 31979907.

It is an arithmetic number, because the mean of its divisors is an integer number (31979907).

Almost surely, 2^63959813 is an apocalyptic number.

It is an amenable number.

63959813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63959813 is an equidigital number, since it uses as much as digits as its factorization.

63959813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 63959813 is about 7997.4879180903. The cubic root of 63959813 is about 399.9162595534.

The spelling of 63959813 in words is "sixty-three million, nine hundred fifty-nine thousand, eight hundred thirteen".