13125556 has 24 divisors (see below), whose sum is σ = 23673384. Its totient is φ = 6364800.

The previous prime is 13125551. The next prime is 13125569. The reversal of 13125556 is 65552131.

It can be written as a sum of positive squares in 4 ways, for example, as 2340900 + 10784656 = 1530^2 + 3284^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13125551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21106 + ... + 21718.

It is an arithmetic number, because the mean of its divisors is an integer number (986391).

Almost surely, 2^13125556 is an apocalyptic number.

It is an amenable number.

13125556 is a deficient number, since it is larger than the sum of its proper divisors (10547828).

13125556 is a wasteful number, since it uses less digits than its factorization.

13125556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 769 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 13125556 is about 3622.9209210249. The cubic root of 13125556 is about 235.8880298105. Note that the first 3 decimals are identical.

Adding to 13125556 its reverse (65552131), we get a palindrome (78677687).

The spelling of 13125556 in words is "thirteen million, one hundred twenty-five thousand, five hundred fifty-six".