13006981 has 4 divisors (see below), whose sum is σ = 14007532. Its totient is φ = 12006432.

The previous prime is 13006967. The next prime is 13006997. The reversal of 13006981 is 18960031.

It is a happy number.

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 6200100 + 6806881 = 2490^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 13006981 - 2¹¹ = 13004933 is a prime.

It is a super-2 number, since 2×13006981² = 338363109468722, 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 (13006951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500256 + ... + 500281.

It is an arithmetic number, because the mean of its divisors is an integer number (3501883).

Almost surely, 2^13006981 is an apocalyptic number.

It is an amenable number.

13006981 is a deficient number, since it is larger than the sum of its proper divisors (1000551).

13006981 is a wasteful number, since it uses less digits than its factorization.

13006981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000550.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 13006981 is about 3606.5192360502. The cubic root of 13006981 is about 235.1755501313.

It can be divided in two parts, 1300 and 6981, that added together give a square (8281 = 91²).

The spelling of 13006981 in words is "thirteen million, six thousand, nine hundred eighty-one".