5581123 has 4 divisors (see below), whose sum is σ = 5602608. Its totient is φ = 5559640.

The previous prime is 5581091. The next prime is 5581129. The reversal of 5581123 is 3211855.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5581123 - 2⁵ = 5581091 is a prime.

It is a super-2 number, since 2×5581123² = 62297867882258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5581129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10348 + ... + 10873.

It is an arithmetic number, because the mean of its divisors is an integer number (1400652).

Almost surely, 2^5581123 is an apocalyptic number.

5581123 is a deficient number, since it is larger than the sum of its proper divisors (21485).

5581123 is a wasteful number, since it uses less digits than its factorization.

5581123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21484.

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

The square root of 5581123 is about 2362.4400521495. The cubic root of 5581123 is about 177.3810404399.

Adding to 5581123 its reverse (3211855), we get a palindrome (8792978).

It can be divided in two parts, 558 and 1123, that added together give a square (1681 = 41²).

The spelling of 5581123 in words is "five million, five hundred eighty-one thousand, one hundred twenty-three".