63865121 has 2 divisors, whose sum is σ = 63865122. Its totient is φ = 63865120.

The previous prime is 63865111. The next prime is 63865147. The reversal of 63865121 is 12156836.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 8526400 = 7439^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 63865121 - 2¹⁴ = 63848737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (63865111) 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, 31932560 + 31932561.

It is an arithmetic number, because the mean of its divisors is an integer number (31932561).

Almost surely, 2^63865121 is an apocalyptic number.

It is an amenable number.

63865121 is a deficient number, since it is larger than the sum of its proper divisors (1).

63865121 is an equidigital number, since it uses as much as digits as its factorization.

63865121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 63865121 is about 7991.5656163232. The cubic root of 63865121 is about 399.7188044523.

The spelling of 63865121 in words is "sixty-three million, eight hundred sixty-five thousand, one hundred twenty-one".