63921769 has 2 divisors, whose sum is σ = 63921770. Its totient is φ = 63921768.

The previous prime is 63921731. The next prime is 63921787. The reversal of 63921769 is 96712936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63792169 + 129600 = 7987^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 63921769 - 2¹⁷ = 63790697 is a prime.

It is a super-2 number, since 2×63921769² = 8171985104178722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63921569) 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, 31960884 + 31960885.

It is an arithmetic number, because the mean of its divisors is an integer number (31960885).

Almost surely, 2^63921769 is an apocalyptic number.

It is an amenable number.

63921769 is a deficient number, since it is larger than the sum of its proper divisors (1).

63921769 is an equidigital number, since it uses as much as digits as its factorization.

63921769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 63921769 is about 7995.1090674237. The cubic root of 63921769 is about 399.8369522976.

The spelling of 63921769 in words is "sixty-three million, nine hundred twenty-one thousand, seven hundred sixty-nine".