63391907 has 4 divisors (see below), whose sum is σ = 63434280. Its totient is φ = 63349536.

The previous prime is 63391903. The next prime is 63391949. The reversal of 63391907 is 70919336.

63391907 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 63391907 - 2² = 63391903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63391903) 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, 18857 + ... + 21962.

It is an arithmetic number, because the mean of its divisors is an integer number (15858570).

Almost surely, 2^63391907 is an apocalyptic number.

63391907 is a deficient number, since it is larger than the sum of its proper divisors (42373).

63391907 is a wasteful number, since it uses less digits than its factorization.

63391907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42372.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 63391907 is about 7961.9034784403. The cubic root of 63391907 is about 398.7291059305.

The spelling of 63391907 in words is "sixty-three million, three hundred ninety-one thousand, nine hundred seven".