13539931 has 2 divisors, whose sum is σ = 13539932.
Its totient is φ = 13539930.
The previous prime is 13539919. The next prime is 13539941. The reversal of 13539931 is 13993531.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 13539931 - 25 = 13539899 is a prime.
It is a super-2 number, since 2×135399312 = 366659462969522, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (13539941) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769965 + 6769966.
It is an arithmetic number, because the mean of its divisors is an integer number (6769966).
Almost surely, 213539931 is an apocalyptic number.
13539931 is a deficient number, since it is larger than the sum of its proper divisors (1).
13539931 is an equidigital number, since it uses as much as digits as its factorization.
13539931 is an evil number, because the sum of its binary digits is even.
The product of its digits is 10935, while the sum is 34.
The square root of 13539931 is about 3679.6645227520.
The cubic root of 13539931 is about 238.3446915653.
The spelling of 13539931 in words is "thirteen million, five hundred thirty-nine thousand, nine hundred thirty-one".