63913613 has 2 divisors, whose sum is σ = 63913614. Its totient is φ = 63913612.

The previous prime is 63913589. The next prime is 63913621. The reversal of 63913613 is 31631936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 2244004 = 7853^2 + 1498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63913613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63913613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63913643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31956806 + 31956807.

It is an arithmetic number, because the mean of its divisors is an integer number (31956807).

Almost surely, 2^63913613 is an apocalyptic number.

It is an amenable number.

63913613 is a deficient number, since it is larger than the sum of its proper divisors (1).

63913613 is an equidigital number, since it uses as much as digits as its factorization.

63913613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 32.

The square root of 63913613 is about 7994.5989893177. The cubic root of 63913613 is about 399.8199460469.

The spelling of 63913613 in words is "sixty-three million, nine hundred thirteen thousand, six hundred thirteen".