6399181 has 4 divisors (see below), whose sum is σ = 6736000. Its totient is φ = 6062364.

The previous prime is 6399161. The next prime is 6399193. The reversal of 6399181 is 1819936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6399181 - 2¹¹ = 6397133 is a prime.

It is a super-2 number, since 2×6399181² = 81899034941522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6399181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168381 + ... + 168418.

It is an arithmetic number, because the mean of its divisors is an integer number (1684000).

Almost surely, 2^6399181 is an apocalyptic number.

6399181 is the 1461-st hex number.

It is an amenable number.

6399181 is a deficient number, since it is larger than the sum of its proper divisors (336819).

6399181 is a wasteful number, since it uses less digits than its factorization.

6399181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336818.

The product of its digits is 11664, while the sum is 37.

The square root of 6399181 is about 2529.6602538681. The cubic root of 6399181 is about 185.6556332957.

The spelling of 6399181 in words is "six million, three hundred ninety-nine thousand, one hundred eighty-one".