63385391 has 4 divisors (see below), whose sum is σ = 63419400. Its totient is φ = 63351384.

The previous prime is 63385373. The next prime is 63385423. The reversal of 63385391 is 19358336.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63385391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63385331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14036 + ... + 17993.

It is an arithmetic number, because the mean of its divisors is an integer number (15854850).

Almost surely, 2^63385391 is an apocalyptic number.

63385391 is a deficient number, since it is larger than the sum of its proper divisors (34009).

63385391 is a wasteful number, since it uses less digits than its factorization.

63385391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34008.

The product of its digits is 58320, while the sum is 38.

The square root of 63385391 is about 7961.4942692939. The cubic root of 63385391 is about 398.7154437876.

The spelling of 63385391 in words is "sixty-three million, three hundred eighty-five thousand, three hundred ninety-one".