11257309 has 12 divisors (see below), whose sum is σ = 13519488. Its totient is φ = 9336600.

The previous prime is 11257243. The next prime is 11257313. The reversal of 11257309 is 90375211.

It is not a de Polignac number, because 11257309 - 2¹¹ = 11255261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11257339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2187 + ... + 5224.

It is an arithmetic number, because the mean of its divisors is an integer number (1126624).

Almost surely, 2^11257309 is an apocalyptic number.

It is an amenable number.

11257309 is a deficient number, since it is larger than the sum of its proper divisors (2262179).

11257309 is an equidigital number, since it uses as much as digits as its factorization.

11257309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7456 (or 7449 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 11257309 is about 3355.1913507280. The cubic root of 11257309 is about 224.1187521374.

The spelling of 11257309 in words is "eleven million, two hundred fifty-seven thousand, three hundred nine".