5918991 has 8 divisors (see below), whose sum is σ = 8499120. Its totient is φ = 3642432.

The previous prime is 5918977. The next prime is 5918999. The reversal of 5918991 is 1998195.

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

It is not a de Polignac number, because 5918991 - 2⁷ = 5918863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5918999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75846 + ... + 75923.

It is an arithmetic number, because the mean of its divisors is an integer number (1062390).

Almost surely, 2^5918991 is an apocalyptic number.

5918991 is a deficient number, since it is larger than the sum of its proper divisors (2580129).

5918991 is a wasteful number, since it uses less digits than its factorization.

5918991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151785.

The product of its digits is 29160, while the sum is 42.

The square root of 5918991 is about 2432.8976550607. The cubic root of 5918991 is about 180.8905558158.

The spelling of 5918991 in words is "five million, nine hundred eighteen thousand, nine hundred ninety-one".