13564981 has 2 divisors, whose sum is σ = 13564982. Its totient is φ = 13564980.

The previous prime is 13564961. The next prime is 13565003. The reversal of 13564981 is 18946531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11329956 + 2235025 = 3366^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 13564981 - 2¹¹ = 13562933 is a prime.

It is a super-2 number, since 2×13564981² = 368017419060722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13564981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13564921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6782490 + 6782491.

It is an arithmetic number, because the mean of its divisors is an integer number (6782491).

Almost surely, 2^13564981 is an apocalyptic number.

It is an amenable number.

13564981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13564981 is an equidigital number, since it uses as much as digits as its factorization.

13564981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 13564981 is about 3683.0667927693. The cubic root of 13564981 is about 238.4915868562.

The spelling of 13564981 in words is "thirteen million, five hundred sixty-four thousand, nine hundred eighty-one".