11881231 has 4 divisors (see below), whose sum is σ = 11974912. Its totient is φ = 11787552.

The previous prime is 11881223. The next prime is 11881237. The reversal of 11881231 is 13218811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13218811 = 163 ⋅81097.

It is a cyclic number.

It is not a de Polignac number, because 11881231 - 2³ = 11881223 is a prime.

It is a super-2 number, since 2×11881231² = 282327300150722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11881196 and 11881205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11881237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46650 + ... + 46903.

It is an arithmetic number, because the mean of its divisors is an integer number (2993728).

Almost surely, 2^11881231 is an apocalyptic number.

11881231 is a deficient number, since it is larger than the sum of its proper divisors (93681).

11881231 is an equidigital number, since it uses as much as digits as its factorization.

11881231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93680.

The product of its digits is 384, while the sum is 25.

The square root of 11881231 is about 3446.9161579592. The cubic root of 11881231 is about 228.1850285763.

The spelling of 11881231 in words is "eleven million, eight hundred eighty-one thousand, two hundred thirty-one".