5987991 has 16 divisors (see below), whose sum is σ = 8373248. Its totient is φ = 3805560.

The previous prime is 5987977. The next prime is 5988001. The reversal of 5987991 is 1997895.

It is not a de Polignac number, because 5987991 - 2⁵ = 5987959 is a prime.

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 5987991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5987911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89340 + ... + 89406.

It is an arithmetic number, because the mean of its divisors is an integer number (523328).

Almost surely, 2^5987991 is an apocalyptic number.

5987991 is a deficient number, since it is larger than the sum of its proper divisors (2385257).

5987991 is an frugal number, since it uses more digits than its factorization.

5987991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 101 counting only the distinct ones).

The product of its digits is 204120, while the sum is 48.

The square root of 5987991 is about 2447.0371881114. The cubic root of 5987991 is about 181.5907460822.

The spelling of 5987991 in words is "five million, nine hundred eighty-seven thousand, nine hundred ninety-one".