11161605 has 96 divisors (see below), whose sum is σ = 24033024. Its totient is φ = 4313088.

The previous prime is 11161603. The next prime is 11161609. The reversal of 11161605 is 50616111.

It is not a de Polignac number, because 11161605 - 2¹ = 11161603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 15.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11161603) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 301647 + ... + 301683.

It is an arithmetic number, because the mean of its divisors is an integer number (250344).

Almost surely, 2^11161605 is an apocalyptic number.

11161605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11161605 is an abundant number, since it is smaller than the sum of its proper divisors (12871419).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11161605 is a wasteful number, since it uses less digits than its factorization.

11161605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11161605 is about 3340.8988311531. The cubic root of 11161605 is about 223.4818286704.

Adding to 11161605 its reverse (50616111), we get a palindrome (61777716).

It can be divided in two parts, 111 and 61605, that added together give a palindrome (61716).

The spelling of 11161605 in words is "eleven million, one hundred sixty-one thousand, six hundred five".