11287309 has 4 divisors (see below), whose sum is σ = 12313440. Its totient is φ = 10261180.

The previous prime is 11287307. The next prime is 11287313. The reversal of 11287309 is 90378211.

11287309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11287309 - 2¹ = 11287307 is a prime.

It is a super-2 number, since 2×11287309² = 254806688922962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513049 + ... + 513070.

It is an arithmetic number, because the mean of its divisors is an integer number (3078360).

Almost surely, 2^11287309 is an apocalyptic number.

It is an amenable number.

11287309 is a deficient number, since it is larger than the sum of its proper divisors (1026131).

11287309 is a wasteful number, since it uses less digits than its factorization.

11287309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026130.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 11287309 is about 3359.6590600833. The cubic root of 11287309 is about 224.3176628709.

The spelling of 11287309 in words is "eleven million, two hundred eighty-seven thousand, three hundred nine".