13539971 has 2 divisors, whose sum is σ = 13539972. Its totient is φ = 13539970.

The previous prime is 13539961. The next prime is 13539979. The reversal of 13539971 is 17993531.

13539971 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13539971 - 2⁶ = 13539907 is a prime.

It is not a weakly prime, because it can be changed into another prime (13539979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769985 + 6769986.

It is an arithmetic number, because the mean of its divisors is an integer number (6769986).

Almost surely, 2^13539971 is an apocalyptic number.

13539971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13539971 is an equidigital number, since it uses as much as digits as its factorization.

13539971 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 13539971 is about 3679.6699580261. The cubic root of 13539971 is about 238.3449262730.

The spelling of 13539971 in words is "thirteen million, five hundred thirty-nine thousand, nine hundred seventy-one".