13921231 has 2 divisors, whose sum is σ = 13921232. Its totient is φ = 13921230.

The previous prime is 13921223. The next prime is 13921241. The reversal of 13921231 is 13212931.

13921231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13212931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13921231 - 2³ = 13921223 is a prime.

It is a super-2 number, since 2×13921231² = 387601345110722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13921211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960615 + 6960616.

It is an arithmetic number, because the mean of its divisors is an integer number (6960616).

Almost surely, 2^13921231 is an apocalyptic number.

13921231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921231 is an equidigital number, since it uses as much as digits as its factorization.

13921231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 13921231 is about 3731.1165889047. The cubic root of 13921231 is about 240.5613653284.

The spelling of 13921231 in words is "thirteen million, nine hundred twenty-one thousand, two hundred thirty-one".