5131581 has 16 divisors (see below), whose sum is σ = 8421504. Its totient is φ = 2706624.

The previous prime is 5131571. The next prime is 5131627. The reversal of 5131581 is 1851315.

5131581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5131581 - 2⁶ = 5131517 is a prime.

It is a super-2 number, since 2×5131581² = 52666247119122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131541) 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 15 ways as a sum of consecutive naturals, for example, 9126 + ... + 9671.

It is an arithmetic number, because the mean of its divisors is an integer number (526344).

Almost surely, 2^5131581 is an apocalyptic number.

It is an amenable number.

5131581 is a deficient number, since it is larger than the sum of its proper divisors (3289923).

5131581 is a wasteful number, since it uses less digits than its factorization.

5131581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18820.

The product of its digits is 600, while the sum is 24.

The square root of 5131581 is about 2265.2993179710. The cubic root of 5131581 is about 172.4846279097.

Adding to 5131581 its reverse (1851315), we get a palindrome (6982896).

The spelling of 5131581 in words is "five million, one hundred thirty-one thousand, five hundred eighty-one".