13981361 has 4 divisors (see below), whose sum is σ = 14803812. Its totient is φ = 13158912.

The previous prime is 13981351. The next prime is 13981379. The reversal of 13981361 is 16318931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16318931 = 73 ⋅223547.

It can be written as a sum of positive squares in 2 ways, for example, as 4648336 + 9333025 = 2156^2 + 3055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13981361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13981351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411200 + ... + 411233.

It is an arithmetic number, because the mean of its divisors is an integer number (3700953).

Almost surely, 2^13981361 is an apocalyptic number.

It is an amenable number.

13981361 is a deficient number, since it is larger than the sum of its proper divisors (822451).

13981361 is an equidigital number, since it uses as much as digits as its factorization.

13981361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822450.

The product of its digits is 3888, while the sum is 32.

The square root of 13981361 is about 3739.1658160611. The cubic root of 13981361 is about 240.9072202450.

The spelling of 13981361 in words is "thirteen million, nine hundred eighty-one thousand, three hundred sixty-one".