5855991 has 4 divisors (see below), whose sum is σ = 7807992. Its totient is φ = 3903992.

The previous prime is 5855981. The next prime is 5856013. The reversal of 5855991 is 1995585.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5855991 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5855911) 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, 975996 + ... + 976001.

It is an arithmetic number, because the mean of its divisors is an integer number (1951998).

Almost surely, 2^5855991 is an apocalyptic number.

5855991 is a deficient number, since it is larger than the sum of its proper divisors (1952001).

5855991 is a wasteful number, since it uses less digits than its factorization.

5855991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952000.

The product of its digits is 81000, while the sum is 42.

The square root of 5855991 is about 2419.9154943923. The cubic root of 5855991 is about 180.2464833112.

The spelling of 5855991 in words is "five million, eight hundred fifty-five thousand, nine hundred ninety-one".