11172609 has 24 divisors (see below), whose sum is σ = 18624320. Its totient is φ = 6321888.

The previous prime is 11172607. The next prime is 11172611. The reversal of 11172609 is 90627111.

It is an interprime number because it is at equal distance from previous prime (11172607) and next prime (11172611).

It is not a de Polignac number, because 11172609 - 2¹ = 11172607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172607) 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 in 23 ways as a sum of consecutive naturals, for example, 6054 + ... + 7680.

Almost surely, 2^11172609 is an apocalyptic number.

It is an amenable number.

11172609 is a deficient number, since it is larger than the sum of its proper divisors (7451711).

11172609 is a wasteful number, since it uses less digits than its factorization.

11172609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 11172609 is about 3342.5452876513. The cubic root of 11172609 is about 223.5552466161. Note that the first 3 decimals are identical.

It can be divided in two parts, 11172 and 609, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 11172609 in words is "eleven million, one hundred seventy-two thousand, six hundred nine".