13509943 has 2 divisors, whose sum is σ = 13509944. Its totient is φ = 13509942.

The previous prime is 13509919. The next prime is 13509967. The reversal of 13509943 is 34990531.

It is a balanced prime because it is at equal distance from previous prime (13509919) and next prime (13509967).

It is an emirp because it is prime and its reverse (34990531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13509943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13509899 and 13509908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13509913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6754971 + 6754972.

It is an arithmetic number, because the mean of its divisors is an integer number (6754972).

Almost surely, 2^13509943 is an apocalyptic number.

13509943 is a deficient number, since it is larger than the sum of its proper divisors (1).

13509943 is an equidigital number, since it uses as much as digits as its factorization.

13509943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 13509943 is about 3675.5874360434. The cubic root of 13509943 is about 238.1686009630.

The spelling of 13509943 in words is "thirteen million, five hundred nine thousand, nine hundred forty-three".