13109656 has 48 divisors (see below), whose sum is σ = 29179440. Its totient is φ = 5503680.

The previous prime is 13109651. The next prime is 13109659. The reversal of 13109656 is 65690131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13109651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20461 + ... + 21091.

It is an arithmetic number, because the mean of its divisors is an integer number (607905).

Almost surely, 2^13109656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13109656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14589720).

13109656 is an abundant number, since it is smaller than the sum of its proper divisors (16069784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13109656 is a wasteful number, since it uses less digits than its factorization.

13109656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 13109656 is about 3620.7258940715. The cubic root of 13109656 is about 235.7927415254.

Adding to 13109656 its reverse (65690131), we get a palindrome (78799787).

The spelling of 13109656 in words is "thirteen million, one hundred nine thousand, six hundred fifty-six".