5581531 has 2 divisors, whose sum is σ = 5581532. Its totient is φ = 5581530.

The previous prime is 5581493. The next prime is 5581547. The reversal of 5581531 is 1351855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5581531 - 2⁷ = 5581403 is a prime.

It is a super-2 number, since 2×5581531² = 62306976607922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5581531.

It is not a weakly prime, because it can be changed into another prime (5581591) 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 as a sum of consecutive naturals, namely, 2790765 + 2790766.

It is an arithmetic number, because the mean of its divisors is an integer number (2790766).

Almost surely, 2^5581531 is an apocalyptic number.

5581531 is a deficient number, since it is larger than the sum of its proper divisors (1).

5581531 is an equidigital number, since it uses as much as digits as its factorization.

5581531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 28.

The square root of 5581531 is about 2362.5264019689. The cubic root of 5581531 is about 177.3853627301.

The spelling of 5581531 in words is "five million, five hundred eighty-one thousand, five hundred thirty-one".