5231581 has 2 divisors, whose sum is σ = 5231582. Its totient is φ = 5231580.

The previous prime is 5231579. The next prime is 5231599. The reversal of 5231581 is 1851325.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 1464100 = 1941^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 5231581 - 2¹ = 5231579 is a prime.

It is a super-2 number, since 2×5231581² = 54738879519122, which contains 22 as substring.

Together with 5231579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5231521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2615790 + 2615791.

It is an arithmetic number, because the mean of its divisors is an integer number (2615791).

Almost surely, 2^5231581 is an apocalyptic number.

It is an amenable number.

5231581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5231581 is an equidigital number, since it uses as much as digits as its factorization.

5231581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 5231581 is about 2287.2649606025. The cubic root of 5231581 is about 173.5978403216.

The spelling of 5231581 in words is "five million, two hundred thirty-one thousand, five hundred eighty-one".