11521143 has 8 divisors (see below), whose sum is σ = 17068400. Its totient is φ = 7680744.

The previous prime is 11521051. The next prime is 11521187. The reversal of 11521143 is 34112511.

11521143 is a `hidden beast` number, since 1 + 1 + 521 + 143 = 666.

It is not a de Polignac number, because 11521143 - 2¹² = 11517047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11523143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213328 + ... + 213381.

It is an arithmetic number, because the mean of its divisors is an integer number (2133550).

Almost surely, 2^11521143 is an apocalyptic number.

11521143 is a deficient number, since it is larger than the sum of its proper divisors (5547257).

11521143 is an equidigital number, since it uses as much as digits as its factorization.

11521143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426718 (or 426712 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 11521143 is about 3394.2809253213. The cubic root of 11521143 is about 225.8561161579.

Adding to 11521143 its reverse (34112511), we get a palindrome (45633654).

It can be divided in two parts, 11521 and 143, that added together give a square (11664 = 108²).

The spelling of 11521143 in words is "eleven million, five hundred twenty-one thousand, one hundred forty-three".