63865489 has 2 divisors, whose sum is σ = 63865490. Its totient is φ = 63865488.

The previous prime is 63865471. The next prime is 63865493. The reversal of 63865489 is 98456836.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44355600 + 19509889 = 6660^2 + 4417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63865489 is a prime.

It is not a weakly prime, because it can be changed into another prime (63865409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31932744 + 31932745.

It is an arithmetic number, because the mean of its divisors is an integer number (31932745).

Almost surely, 2^63865489 is an apocalyptic number.

It is an amenable number.

63865489 is a deficient number, since it is larger than the sum of its proper divisors (1).

63865489 is an equidigital number, since it uses as much as digits as its factorization.

63865489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 63865489 is about 7991.5886405645. The cubic root of 63865489 is about 399.7195721966.

The spelling of 63865489 in words is "sixty-three million, eight hundred sixty-five thousand, four hundred eighty-nine".