5991557 has 18 divisors (see below), whose sum is σ = 7155666. Its totient is φ = 5010720.

The previous prime is 5991553. The next prime is 5991563. The reversal of 5991557 is 7551995.

It can be written as a sum of positive squares in 3 ways, for example, as 450241 + 5541316 = 671^2 + 2354^2 .

It is not a de Polignac number, because 5991557 - 2² = 5991553 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 (5991551) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20303 + ... + 20595.

It is an arithmetic number, because the mean of its divisors is an integer number (397537).

Almost surely, 2^5991557 is an apocalyptic number.

It is an amenable number.

5991557 is a deficient number, since it is larger than the sum of its proper divisors (1164109).

5991557 is a wasteful number, since it uses less digits than its factorization.

5991557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 317 counting only the distinct ones).

The product of its digits is 70875, while the sum is 41.

The square root of 5991557 is about 2447.7657159132. The cubic root of 5991557 is about 181.6267862220.

The spelling of 5991557 in words is "five million, nine hundred ninety-one thousand, five hundred fifty-seven".