63681413 has 2 divisors, whose sum is σ = 63681414. Its totient is φ = 63681412.

The previous prime is 63681389. The next prime is 63681433. The reversal of 63681413 is 31418636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63329764 + 351649 = 7958^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 63681413 - 2¹⁰ = 63680389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63681413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63681433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840706 + 31840707.

It is an arithmetic number, because the mean of its divisors is an integer number (31840707).

Almost surely, 2^63681413 is an apocalyptic number.

It is an amenable number.

63681413 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681413 is an equidigital number, since it uses as much as digits as its factorization.

63681413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 63681413 is about 7980.0634709255. The cubic root of 63681413 is about 399.3351727072.

The spelling of 63681413 in words is "sixty-three million, six hundred eighty-one thousand, four hundred thirteen".