6115991 has 8 divisors (see below), whose sum is σ = 7068960. Its totient is φ = 5182848.

The previous prime is 6115979. The next prime is 6116009. The reversal of 6115991 is 1995116.

It is a happy number.

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 6115991 - 2⁶ = 6115927 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 (6115931) 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, 4286 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (883620).

Almost surely, 2^6115991 is an apocalyptic number.

6115991 is a deficient number, since it is larger than the sum of its proper divisors (952969).

6115991 is an equidigital number, since it uses as much as digits as its factorization.

6115991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913.

The product of its digits is 2430, while the sum is 32.

The square root of 6115991 is about 2473.0529715313. The cubic root of 6115991 is about 182.8755362183.

The spelling of 6115991 in words is "six million, one hundred fifteen thousand, nine hundred ninety-one".