11661123 has 16 divisors (see below), whose sum is σ = 15998976. Its totient is φ = 7551360.

The previous prime is 11661121. The next prime is 11661151. The reversal of 11661123 is 32116611.

It is not a de Polignac number, because 11661123 - 2¹ = 11661121 is a prime.

It is a super-2 number, since 2×11661123² = 271963579242258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11661123.

It is not an unprimeable number, because it can be changed into a prime (11661121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26715 + ... + 27147.

It is an arithmetic number, because the mean of its divisors is an integer number (999936).

Almost surely, 2^11661123 is an apocalyptic number.

11661123 is a deficient number, since it is larger than the sum of its proper divisors (4337853).

11661123 is a wasteful number, since it uses less digits than its factorization.

11661123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674.

The product of its digits is 216, while the sum is 21.

The square root of 11661123 is about 3414.8386491897. The cubic root of 11661123 is about 226.7671413940.

Adding to 11661123 its reverse (32116611), we get a palindrome (43777734).

The spelling of 11661123 in words is "eleven million, six hundred sixty-one thousand, one hundred twenty-three".