13863121 has 2 divisors, whose sum is σ = 13863122. Its totient is φ = 13863120.

The previous prime is 13863119. The next prime is 13863139. The reversal of 13863121 is 12136831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 1690000 = 3489^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13863121 - 2¹ = 13863119 is a prime.

It is a super-2 number, since 2×13863121² = 384372247721282, which contains 22 as substring.

Together with 13863119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13863191) 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 as a sum of consecutive naturals, namely, 6931560 + 6931561.

It is an arithmetic number, because the mean of its divisors is an integer number (6931561).

Almost surely, 2^13863121 is an apocalyptic number.

It is an amenable number.

13863121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13863121 is an equidigital number, since it uses as much as digits as its factorization.

13863121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 13863121 is about 3723.3212324483. The cubic root of 13863121 is about 240.2261814504.

Adding to 13863121 its reverse (12136831), we get a palindrome (25999952).

The spelling of 13863121 in words is "thirteen million, eight hundred sixty-three thousand, one hundred twenty-one".