13931329 has 2 divisors, whose sum is σ = 13931330. Its totient is φ = 13931328.

The previous prime is 13931327. The next prime is 13931341. The reversal of 13931329 is 92313931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 204304 = 3705^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 13931329 - 2¹ = 13931327 is a prime.

Together with 13931327, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13931329.

It is not a weakly prime, because it can be changed into another prime (13931327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6965664 + 6965665.

It is an arithmetic number, because the mean of its divisors is an integer number (6965665).

Almost surely, 2^13931329 is an apocalyptic number.

It is an amenable number.

13931329 is a deficient number, since it is larger than the sum of its proper divisors (1).

13931329 is an equidigital number, since it uses as much as digits as its factorization.

13931329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 31.

The square root of 13931329 is about 3732.4695578129. The cubic root of 13931329 is about 240.6195163534.

The spelling of 13931329 in words is "thirteen million, nine hundred thirty-one thousand, three hundred twenty-nine".