13155681 has 16 divisors (see below), whose sum is σ = 21869568. Its totient is φ = 6834000.

The previous prime is 13155679. The next prime is 13155689. The reversal of 13155681 is 18655131.

13155681 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13155681 - 2¹ = 13155679 is a prime.

It is a super-2 number, since 2×13155681² = 346143885147522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13155689) 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, 28245 + ... + 28706.

It is an arithmetic number, because the mean of its divisors is an integer number (1366848).

Almost surely, 2^13155681 is an apocalyptic number.

13155681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13155681 is a deficient number, since it is larger than the sum of its proper divisors (8713887).

13155681 is a wasteful number, since it uses less digits than its factorization.

13155681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56972.

The product of its digits is 3600, while the sum is 30.

The square root of 13155681 is about 3627.0760951488. The cubic root of 13155681 is about 236.0683573410.

It can be divided in two parts, 131556 and 81, that multiplied together give a triangular number (10656036 = T₄₆₁₆).

The spelling of 13155681 in words is "thirteen million, one hundred fifty-five thousand, six hundred eighty-one".