11632181 has 12 divisors (see below), whose sum is σ = 13272000. Its totient is φ = 10109880.

The previous prime is 11632157. The next prime is 11632213. The reversal of 11632181 is 18123611.

It is not a de Polignac number, because 11632181 - 2¹⁰ = 11631157 is a prime.

It is a super-2 number, since 2×11632181² = 270615269633522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11632111) 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, 4820 + ... + 6818.

It is an arithmetic number, because the mean of its divisors is an integer number (1106000).

Almost surely, 2^11632181 is an apocalyptic number.

11632181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11632181 is a deficient number, since it is larger than the sum of its proper divisors (1639819).

11632181 is a wasteful number, since it uses less digits than its factorization.

11632181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2033 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 11632181 is about 3410.5983346035. The cubic root of 11632181 is about 226.5793798379.

Adding to 11632181 its reverse (18123611), we get a palindrome (29755792).

The spelling of 11632181 in words is "eleven million, six hundred thirty-two thousand, one hundred eighty-one".