6139991 has 8 divisors (see below), whose sum is σ = 7213584. Its totient is φ = 5152320.

The previous prime is 6139979. The next prime is 6139993. The reversal of 6139991 is 1999316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6139991 - 2²² = 1945687 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 (6139993) 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 7 ways as a sum of consecutive naturals, for example, 21326 + ... + 21611.

It is an arithmetic number, because the mean of its divisors is an integer number (901698).

Almost surely, 2^6139991 is an apocalyptic number.

6139991 is a deficient number, since it is larger than the sum of its proper divisors (1073593).

6139991 is a wasteful number, since it uses less digits than its factorization.

6139991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42961.

The product of its digits is 13122, while the sum is 38.

The square root of 6139991 is about 2477.9005226199. The cubic root of 6139991 is about 183.1144336878.

The spelling of 6139991 in words is "six million, one hundred thirty-nine thousand, nine hundred ninety-one".