13889531 has 2 divisors, whose sum is σ = 13889532. Its totient is φ = 13889530.

The previous prime is 13889509. The next prime is 13889567. The reversal of 13889531 is 13598831.

It is a weak prime.

It is an emirp because it is prime and its reverse (13598831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13889531 - 2¹⁴ = 13873147 is a prime.

It is a super-2 number, since 2×13889531² = 385838142799922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13889591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944765 + 6944766.

It is an arithmetic number, because the mean of its divisors is an integer number (6944766).

Almost surely, 2^13889531 is an apocalyptic number.

13889531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13889531 is an equidigital number, since it uses as much as digits as its factorization.

13889531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 13889531 is about 3726.8661097496. The cubic root of 13889531 is about 240.3786326654.

The spelling of 13889531 in words is "thirteen million, eight hundred eighty-nine thousand, five hundred thirty-one".