63864961 has 2 divisors, whose sum is σ = 63864962. Its totient is φ = 63864960.

The previous prime is 63864919. The next prime is 63865033. The reversal of 63864961 is 16946836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63504961 + 360000 = 7969^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 63864961 - 2¹³ = 63856769 is a prime.

It is not a weakly prime, because it can be changed into another prime (63864901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31932480 + 31932481.

It is an arithmetic number, because the mean of its divisors is an integer number (31932481).

Almost surely, 2^63864961 is an apocalyptic number.

It is an amenable number.

63864961 is a deficient number, since it is larger than the sum of its proper divisors (1).

63864961 is an equidigital number, since it uses as much as digits as its factorization.

63864961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 63864961 is about 7991.5556057629. Note that the first 3 decimals coincide. The cubic root of 63864961 is about 399.7184706495.

The spelling of 63864961 in words is "sixty-three million, eight hundred sixty-four thousand, nine hundred sixty-one".