63109391 has 4 divisors (see below), whose sum is σ = 64452192. Its totient is φ = 61766592.

The previous prime is 63109363. The next prime is 63109411. The reversal of 63109391 is 19390136.

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 63109391 - 2⁶ = 63109327 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 (63105391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671330 + ... + 671423.

It is an arithmetic number, because the mean of its divisors is an integer number (16113048).

Almost surely, 2^63109391 is an apocalyptic number.

63109391 is a deficient number, since it is larger than the sum of its proper divisors (1342801).

63109391 is a wasteful number, since it uses less digits than its factorization.

63109391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342800.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 63109391 is about 7944.1419297492. The cubic root of 63109391 is about 398.1358908208.

The spelling of 63109391 in words is "sixty-three million, one hundred nine thousand, three hundred ninety-one".