13109128 has 8 divisors (see below), whose sum is σ = 24579630. Its totient is φ = 6554560.

The previous prime is 13109111. The next prime is 13109167. The reversal of 13109128 is 82190131.

It can be written as a sum of positive squares in only one way, i.e., 8538084 + 4571044 = 2922^2 + 2138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819313 + ... + 819328.

Almost surely, 2^13109128 is an apocalyptic number.

It is an amenable number.

13109128 is a deficient number, since it is larger than the sum of its proper divisors (11470502).

13109128 is a wasteful number, since it uses less digits than its factorization.

13109128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638647 (or 1638643 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 13109128 is about 3620.6529797814. The cubic root of 13109128 is about 235.7895759138.

Adding to 13109128 its reverse (82190131), we get a palindrome (95299259).

The spelling of 13109128 in words is "thirteen million, one hundred nine thousand, one hundred twenty-eight".