63966731 has 2 divisors, whose sum is σ = 63966732. Its totient is φ = 63966730.

The previous prime is 63966659. The next prime is 63966739. The reversal of 63966731 is 13766936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63966731 - 2¹⁴ = 63950347 is a prime.

It is a super-2 number, since 2×63966731² = 8183485349652722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63966739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31983365 + 31983366.

It is an arithmetic number, because the mean of its divisors is an integer number (31983366).

Almost surely, 2^63966731 is an apocalyptic number.

63966731 is a deficient number, since it is larger than the sum of its proper divisors (1).

63966731 is an equidigital number, since it uses as much as digits as its factorization.

63966731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 41.

The square root of 63966731 is about 7997.9204172085. The cubic root of 63966731 is about 399.9306775700.

The spelling of 63966731 in words is "sixty-three million, nine hundred sixty-six thousand, seven hundred thirty-one".