6127991 has 4 divisors (see below), whose sum is σ = 6140232. Its totient is φ = 6115752.

The previous prime is 6127969. The next prime is 6127993. The reversal of 6127991 is 1997216.

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 6127991 - 2¹⁴ = 6111607 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 (6127993) 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, 5336 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (1535058).

Almost surely, 2^6127991 is an apocalyptic number.

6127991 is a deficient number, since it is larger than the sum of its proper divisors (12241).

6127991 is a wasteful number, since it uses less digits than its factorization.

6127991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12240.

The product of its digits is 6804, while the sum is 35.

The square root of 6127991 is about 2475.4779336524. The cubic root of 6127991 is about 182.9950629223.

The spelling of 6127991 in words is "six million, one hundred twenty-seven thousand, nine hundred ninety-one".