13523969 has 2 divisors, whose sum is σ = 13523970. Its totient is φ = 13523968.

The previous prime is 13523933. The next prime is 13523989. The reversal of 13523969 is 96932531.

13523969 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10758400 + 2765569 = 3280^2 + 1663^2 .

It is an emirp because it is prime and its reverse (96932531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13523969 is a prime.

It is a super-2 number, since 2×13523969² = 365795475025922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13523989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6761984 + 6761985.

It is an arithmetic number, because the mean of its divisors is an integer number (6761985).

Almost surely, 2^13523969 is an apocalyptic number.

It is an amenable number.

13523969 is a deficient number, since it is larger than the sum of its proper divisors (1).

13523969 is an equidigital number, since it uses as much as digits as its factorization.

13523969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 13523969 is about 3677.4949354146. The cubic root of 13523969 is about 238.2509945357.

The spelling of 13523969 in words is "thirteen million, five hundred twenty-three thousand, nine hundred sixty-nine".