11531232 has 36 divisors (see below), whose sum is σ = 32792760. Its totient is φ = 3843648.

The previous prime is 11531231. The next prime is 11531239. The reversal of 11531232 is 23213511.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×11531232² = 265938622875648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19732 + ... + 20307.

It is an arithmetic number, because the mean of its divisors is an integer number (910910).

Almost surely, 2^11531232 is an apocalyptic number.

11531232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11531232 is an abundant number, since it is smaller than the sum of its proper divisors (21261528).

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

11531232 is a wasteful number, since it uses less digits than its factorization.

11531232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40055 (or 40044 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 11531232 is about 3395.7667764439. The cubic root of 11531232 is about 225.9220238993.

Adding to 11531232 its reverse (23213511), we get a palindrome (34744743).

The spelling of 11531232 in words is "eleven million, five hundred thirty-one thousand, two hundred thirty-two".