13809871 has 2 divisors, whose sum is σ = 13809872. Its totient is φ = 13809870.

The previous prime is 13809847. The next prime is 13809881. The reversal of 13809871 is 17890831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13809871 - 2⁹ = 13809359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13809871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13809811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6904935 + 6904936.

It is an arithmetic number, because the mean of its divisors is an integer number (6904936).

Almost surely, 2^13809871 is an apocalyptic number.

13809871 is a deficient number, since it is larger than the sum of its proper divisors (1).

13809871 is an equidigital number, since it uses as much as digits as its factorization.

13809871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 13809871 is about 3716.1634786430. The cubic root of 13809871 is about 239.9182070815.

The spelling of 13809871 in words is "thirteen million, eight hundred nine thousand, eight hundred seventy-one".