11172309 has 4 divisors (see below), whose sum is σ = 14896416. Its totient is φ = 7448204.

The previous prime is 11172289. The next prime is 11172311. The reversal of 11172309 is 90327111.

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 11172309 - 2¹⁷ = 11041237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11172379) 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, 1862049 + ... + 1862054.

It is an arithmetic number, because the mean of its divisors is an integer number (3724104).

Almost surely, 2^11172309 is an apocalyptic number.

It is an amenable number.

11172309 is a deficient number, since it is larger than the sum of its proper divisors (3724107).

11172309 is an equidigital number, since it uses as much as digits as its factorization.

11172309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724106.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 11172309 is about 3342.5004113687. The cubic root of 11172309 is about 223.5532456757.

The spelling of 11172309 in words is "eleven million, one hundred seventy-two thousand, three hundred nine".