63909697 has 2 divisors, whose sum is σ = 63909698. Its totient is φ = 63909696.

The previous prime is 63909683. The next prime is 63909701. The reversal of 63909697 is 79690936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40056241 + 23853456 = 6329^2 + 4884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63909697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63909697.

It is not a weakly prime, because it can be changed into another prime (63901697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31954848 + 31954849.

It is an arithmetic number, because the mean of its divisors is an integer number (31954849).

Almost surely, 2^63909697 is an apocalyptic number.

It is an amenable number.

63909697 is a deficient number, since it is larger than the sum of its proper divisors (1).

63909697 is an equidigital number, since it uses as much as digits as its factorization.

63909697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 63909697 is about 7994.3540702173. The cubic root of 63909697 is about 399.8117801972.

The spelling of 63909697 in words is "sixty-three million, nine hundred nine thousand, six hundred ninety-seven".