13707509 has 2 divisors, whose sum is σ = 13707510. Its totient is φ = 13707508.

The previous prime is 13707469. The next prime is 13707511. The reversal of 13707509 is 90570731.

13707509 is digitally balanced in base 2, 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., 11242609 + 2464900 = 3353^2 + 1570^2 .

It is an emirp because it is prime and its reverse (90570731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13707509 is a prime.

Together with 13707511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13707539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6853754 + 6853755.

It is an arithmetic number, because the mean of its divisors is an integer number (6853755).

Almost surely, 2^13707509 is an apocalyptic number.

It is an amenable number.

13707509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13707509 is an equidigital number, since it uses as much as digits as its factorization.

13707509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 13707509 is about 3702.3653250321. The cubic root of 13707509 is about 239.3239597632.

The spelling of 13707509 in words is "thirteen million, seven hundred seven thousand, five hundred nine".