5991531 has 32 divisors (see below), whose sum is σ = 10418688. Its totient is φ = 2972160.

The previous prime is 5991473. The next prime is 5991533. The reversal of 5991531 is 1351995.

It is not a de Polignac number, because 5991531 - 2¹¹ = 5989483 is a prime.

It is a super-2 number, since 2×5991531² = 71796887447922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5991492 and 5991501.

It is not an unprimeable number, because it can be changed into a prime (5991533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3996 + ... + 5286.

It is an arithmetic number, because the mean of its divisors is an integer number (325584).

Almost surely, 2^5991531 is an apocalyptic number.

5991531 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

5991531 is a deficient number, since it is larger than the sum of its proper divisors (4427157).

5991531 is a wasteful number, since it uses less digits than its factorization.

5991531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331.

The product of its digits is 6075, while the sum is 33.

The square root of 5991531 is about 2447.7604049416. The cubic root of 5991531 is about 181.6265235021.

The spelling of 5991531 in words is "five million, nine hundred ninety-one thousand, five hundred thirty-one".