13123556 has 6 divisors (see below), whose sum is σ = 22966230. Its totient is φ = 6561776.

The previous prime is 13123531. The next prime is 13123577. The reversal of 13123556 is 65532131.

It can be written as a sum of positive squares in only one way, i.e., 8797156 + 4326400 = 2966^2 + 2080^2 .

It is an unprimeable number.

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, 1640441 + ... + 1640448.

It is an arithmetic number, because the mean of its divisors is an integer number (3827705).

Almost surely, 2^13123556 is an apocalyptic number.

It is an amenable number.

13123556 is a deficient number, since it is larger than the sum of its proper divisors (9842674).

13123556 is a wasteful number, since it uses less digits than its factorization.

13123556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280893 (or 3280891 counting only the distinct ones).

The product of its digits is 2700, while the sum is 26.

The square root of 13123556 is about 3622.6448901321. The cubic root of 13123556 is about 235.8760480953.

Adding to 13123556 its reverse (65532131), we get a palindrome (78655687).

The spelling of 13123556 in words is "thirteen million, one hundred twenty-three thousand, five hundred fifty-six".