63688189 has 2 divisors, whose sum is σ = 63688190. Its totient is φ = 63688188.

The previous prime is 63688187. The next prime is 63688213. The reversal of 63688189 is 98188636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 3392964 = 7765^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 63688189 - 2¹ = 63688187 is a prime.

Together with 63688187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63688181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31844094 + 31844095.

It is an arithmetic number, because the mean of its divisors is an integer number (31844095).

Almost surely, 2^63688189 is an apocalyptic number.

It is an amenable number.

63688189 is a deficient number, since it is larger than the sum of its proper divisors (1).

63688189 is an equidigital number, since it uses as much as digits as its factorization.

63688189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 63688189 is about 7980.4880176591. The cubic root of 63688189 is about 399.3493359145.

The spelling of 63688189 in words is "sixty-three million, six hundred eighty-eight thousand, one hundred eighty-nine".