63681953 has 2 divisors, whose sum is σ = 63681954. Its totient is φ = 63681952.

The previous prime is 63681889. The next prime is 63681971. The reversal of 63681953 is 35918636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47100769 + 16581184 = 6863^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 63681953 - 2⁶ = 63681889 is a prime.

It is a super-2 number, since 2×63681953² = 8110782275788418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63681953.

It is not a weakly prime, because it can be changed into another prime (63681973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840976 + 31840977.

It is an arithmetic number, because the mean of its divisors is an integer number (31840977).

Almost surely, 2^63681953 is an apocalyptic number.

It is an amenable number.

63681953 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681953 is an equidigital number, since it uses as much as digits as its factorization.

63681953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 63681953 is about 7980.0973051712. The cubic root of 63681953 is about 399.3363014530.

The spelling of 63681953 in words is "sixty-three million, six hundred eighty-one thousand, nine hundred fifty-three".