5597991 has 28 divisors (see below), whose sum is σ = 9600912. Its totient is φ = 3195936.

The previous prime is 5597987. The next prime is 5598001. The reversal of 5597991 is 1997955.

5597991 is a `hidden beast` number, since 559 + 7 + 9 + 91 = 666.

It is not a de Polignac number, because 5597991 - 2² = 5597987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5597941) 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 27 ways as a sum of consecutive naturals, for example, 4555 + ... + 5651.

Almost surely, 2^5597991 is an apocalyptic number.

5597991 is a deficient number, since it is larger than the sum of its proper divisors (4002921).

5597991 is an equidigital number, since it uses as much as digits as its factorization.

5597991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1107 counting only the distinct ones).

The product of its digits is 127575, while the sum is 45.

The square root of 5597991 is about 2366.0073964381. The cubic root of 5597991 is about 177.5595621045.

The spelling of 5597991 in words is "five million, five hundred ninety-seven thousand, nine hundred ninety-one".