11521231 has 4 divisors (see below), whose sum is σ = 11552992. Its totient is φ = 11489472.

The previous prime is 11521199. The next prime is 11521249. The reversal of 11521231 is 13212511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11521231 - 2⁵ = 11521199 is a prime.

It is a super-2 number, since 2×11521231² = 265477527510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15330 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (2888248).

Almost surely, 2^11521231 is an apocalyptic number.

11521231 is a deficient number, since it is larger than the sum of its proper divisors (31761).

11521231 is an equidigital number, since it uses as much as digits as its factorization.

11521231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31760.

The product of its digits is 60, while the sum is 16.

The square root of 11521231 is about 3394.2938882778. The cubic root of 11521231 is about 225.8566911960.

Adding to 11521231 its reverse (13212511), we get a palindrome (24733742).

The spelling of 11521231 in words is "eleven million, five hundred twenty-one thousand, two hundred thirty-one".