5533991 has 4 divisors (see below), whose sum is σ = 5562000. Its totient is φ = 5505984.

The previous prime is 5533973. The next prime is 5534003. The reversal of 5533991 is 1993355.

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 5533991 - 2²² = 1339687 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 (5533901) 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 3 ways as a sum of consecutive naturals, for example, 13706 + ... + 14103.

It is an arithmetic number, because the mean of its divisors is an integer number (1390500).

Almost surely, 2^5533991 is an apocalyptic number.

5533991 is a deficient number, since it is larger than the sum of its proper divisors (28009).

5533991 is a wasteful number, since it uses less digits than its factorization.

5533991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28008.

The product of its digits is 18225, while the sum is 35.

The square root of 5533991 is about 2352.4436231289. The cubic root of 5533991 is about 176.8803067910.

The spelling of 5533991 in words is "five million, five hundred thirty-three thousand, nine hundred ninety-one".