13939571 has 2 divisors, whose sum is σ = 13939572. Its totient is φ = 13939570.

The previous prime is 13939561. The next prime is 13939573. The reversal of 13939571 is 17593931.

It is a strong prime.

It is an emirp because it is prime and its reverse (17593931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13939571 - 2¹⁸ = 13677427 is a prime.

Together with 13939573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13939573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969785 + 6969786.

It is an arithmetic number, because the mean of its divisors is an integer number (6969786).

Almost surely, 2^13939571 is an apocalyptic number.

13939571 is a deficient number, since it is larger than the sum of its proper divisors (1).

13939571 is an equidigital number, since it uses as much as digits as its factorization.

13939571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25515, while the sum is 38.

The square root of 13939571 is about 3733.5734892995. The cubic root of 13939571 is about 240.6669584672. Note that the first 3 decimals are identical.

The spelling of 13939571 in words is "thirteen million, nine hundred thirty-nine thousand, five hundred seventy-one".