13656881 has 16 divisors (see below), whose sum is σ = 16080768. Its totient is φ = 11356800.

The previous prime is 13656869. The next prime is 13656887. The reversal of 13656881 is 18865631.

It is a happy number.

It is not a de Polignac number, because 13656881 - 2¹⁰ = 13655857 is a prime.

It is a super-2 number, since 2×13656881² = 373020797296322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13656887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48461 + ... + 48741.

It is an arithmetic number, because the mean of its divisors is an integer number (1005048).

Almost surely, 2^13656881 is an apocalyptic number.

It is an amenable number.

13656881 is a deficient number, since it is larger than the sum of its proper divisors (2423887).

13656881 is a wasteful number, since it uses less digits than its factorization.

13656881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472.

The product of its digits is 34560, while the sum is 38.

The square root of 13656881 is about 3695.5217493610. The cubic root of 13656881 is about 239.0289525682.

The spelling of 13656881 in words is "thirteen million, six hundred fifty-six thousand, eight hundred eighty-one".