63381609 has 10 divisors (see below), whose sum is σ = 94681290. Its totient is φ = 42254352.

The previous prime is 63381607. The next prime is 63381649. The reversal of 63381609 is 90618336.

It is a happy number.

63381609 is a `hidden beast` number, since 633 + 8 + 16 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56475225 + 6906384 = 7515^2 + 2628^2 .

It is not a de Polignac number, because 63381609 - 2¹ = 63381607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63381607) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 391164 + ... + 391325.

It is an arithmetic number, because the mean of its divisors is an integer number (9468129).

Almost surely, 2^63381609 is an apocalyptic number.

It is an amenable number.

63381609 is a deficient number, since it is larger than the sum of its proper divisors (31299681).

63381609 is an equidigital number, since it uses as much as digits as its factorization.

63381609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782501 (or 782492 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 63381609 is about 7961.2567475242. The cubic root of 63381609 is about 398.7075136122.

The spelling of 63381609 in words is "sixty-three million, three hundred eighty-one thousand, six hundred nine".