63858989 has 2 divisors, whose sum is σ = 63858990. Its totient is φ = 63858988.

The previous prime is 63858979. The next prime is 63859031. The reversal of 63858989 is 98985836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53904964 + 9954025 = 7342^2 + 3155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63858989 is a prime.

It is a super-2 number, since 2×63858989² = 8155940952204242, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63858979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31929494 + 31929495.

It is an arithmetic number, because the mean of its divisors is an integer number (31929495).

Almost surely, 2^63858989 is an apocalyptic number.

It is an amenable number.

63858989 is a deficient number, since it is larger than the sum of its proper divisors (1).

63858989 is an equidigital number, since it uses as much as digits as its factorization.

63858989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 56.

The square root of 63858989 is about 7991.1819526275. The cubic root of 63858989 is about 399.7060110625.

The spelling of 63858989 in words is "sixty-three million, eight hundred fifty-eight thousand, nine hundred eighty-nine".