6391123199 has 4 divisors (see below), whose sum is σ = 6393705864. Its totient is φ = 6388540536.

The previous prime is 6391123181. The next prime is 6391123223. The reversal of 6391123199 is 9913211936.

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 6391123199 - 2²⁸ = 6122687743 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 (6391123799) 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, 1287617 + ... + 1292570.

It is an arithmetic number, because the mean of its divisors is an integer number (1598426466).

Almost surely, 2^6391123199 is an apocalyptic number.

6391123199 is a deficient number, since it is larger than the sum of its proper divisors (2582665).

6391123199 is a wasteful number, since it uses less digits than its factorization.

6391123199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582664.

The product of its digits is 78732, while the sum is 44.

The square root of 6391123199 is about 79944.5007427027. The cubic root of 6391123199 is about 1855.7767516875.

The spelling of 6391123199 in words is "six billion, three hundred ninety-one million, one hundred twenty-three thousand, one hundred ninety-nine".