11042309 has 2 divisors, whose sum is σ = 11042310. Its totient is φ = 11042308.

The previous prime is 11042303. The next prime is 11042347. The reversal of 11042309 is 90324011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10745284 + 297025 = 3278^2 + 545^2 .

It is an emirp because it is prime and its reverse (90324011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11042309 - 2¹² = 11038213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₇₂₉₁₀₁ and since 11042309 and 729101 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11042303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5521154 + 5521155.

It is an arithmetic number, because the mean of its divisors is an integer number (5521155).

Almost surely, 2^11042309 is an apocalyptic number.

It is an amenable number.

11042309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11042309 is an equidigital number, since it uses as much as digits as its factorization.

11042309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 11042309 is about 3322.9969906697. The cubic root of 11042309 is about 222.6827787334.

Adding to 11042309 its sum of digits (20), we get a square (11042329 = 3323²).

The spelling of 11042309 in words is "eleven million, forty-two thousand, three hundred nine".