63581379 has 4 divisors (see below), whose sum is σ = 84775176. Its totient is φ = 42387584.

The previous prime is 63581363. The next prime is 63581381. The reversal of 63581379 is 97318536.

63581379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63581379 - 2⁴ = 63581363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63581379.

It is not an unprimeable number, because it can be changed into a prime (63581339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10596894 + ... + 10596899.

It is an arithmetic number, because the mean of its divisors is an integer number (21193794).

Almost surely, 2^63581379 is an apocalyptic number.

63581379 is a deficient number, since it is larger than the sum of its proper divisors (21193797).

63581379 is a wasteful number, since it uses less digits than its factorization.

63581379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21193796.

The product of its digits is 136080, while the sum is 42.

The square root of 63581379 is about 7973.7932629333. The cubic root of 63581379 is about 399.1259644624.

The spelling of 63581379 in words is "sixty-three million, five hundred eighty-one thousand, three hundred seventy-nine".