13682981 has 4 divisors (see below), whose sum is σ = 14735532. Its totient is φ = 12630432.

The previous prime is 13682951. The next prime is 13683013. The reversal of 13682981 is 18928631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 6974881 = 2590^2 + 2641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13682981 is a prime.

It is a super-2 number, since 2×13682981² = 374447938092722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13682951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526256 + ... + 526281.

It is an arithmetic number, because the mean of its divisors is an integer number (3683883).

Almost surely, 2^13682981 is an apocalyptic number.

It is an amenable number.

13682981 is a deficient number, since it is larger than the sum of its proper divisors (1052551).

13682981 is a wasteful number, since it uses less digits than its factorization.

13682981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052550.

The product of its digits is 20736, while the sum is 38.

The square root of 13682981 is about 3699.0513648772. The cubic root of 13682981 is about 239.1811270311.

The spelling of 13682981 in words is "thirteen million, six hundred eighty-two thousand, nine hundred eighty-one".