11161809 has 12 divisors (see below), whose sum is σ = 17071236. Its totient is φ = 7003392.

The previous prime is 11161807. The next prime is 11161847. The reversal of 11161809 is 90816111.

It can be written as a sum of positive squares in 2 ways, for example, as 7049025 + 4112784 = 2655^2 + 2028^2 .

It is not a de Polignac number, because 11161809 - 2¹ = 11161807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11161807) 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, 36324 + ... + 36629.

It is an arithmetic number, because the mean of its divisors is an integer number (1422603).

Almost surely, 2^11161809 is an apocalyptic number.

It is an amenable number.

11161809 is a deficient number, since it is larger than the sum of its proper divisors (5909427).

11161809 is a wasteful number, since it uses less digits than its factorization.

11161809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72976 (or 72973 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 11161809 is about 3340.9293617196. The cubic root of 11161809 is about 223.4831901836.

The spelling of 11161809 in words is "eleven million, one hundred sixty-one thousand, eight hundred nine".