11509943 has 2 divisors, whose sum is σ = 11509944. Its totient is φ = 11509942.

The previous prime is 11509933. The next prime is 11509963. The reversal of 11509943 is 34990511.

It is a weak prime.

It is an emirp because it is prime and its reverse (34990511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11509943 - 2¹⁰ = 11508919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11509933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5754971 + 5754972.

It is an arithmetic number, because the mean of its divisors is an integer number (5754972).

Almost surely, 2^11509943 is an apocalyptic number.

11509943 is a deficient number, since it is larger than the sum of its proper divisors (1).

11509943 is an equidigital number, since it uses as much as digits as its factorization.

11509943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 11509943 is about 3392.6306901872. The cubic root of 11509943 is about 225.7829055793.

The spelling of 11509943 in words is "eleven million, five hundred nine thousand, nine hundred forty-three".