11543131 has 4 divisors (see below), whose sum is σ = 11941200. Its totient is φ = 11145064.

The previous prime is 11543123. The next prime is 11543143. The reversal of 11543131 is 13134511.

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 11543131 - 2³ = 11543123 is a prime.

It is a super-2 number, since 2×11543131² = 266487746566322, 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 = 11543099 and 11543108.

It is not an unprimeable number, because it can be changed into a prime (11543101) 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, 198991 + ... + 199048.

It is an arithmetic number, because the mean of its divisors is an integer number (2985300).

Almost surely, 2^11543131 is an apocalyptic number.

11543131 is a deficient number, since it is larger than the sum of its proper divisors (398069).

11543131 is an equidigital number, since it uses as much as digits as its factorization.

11543131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398068.

The product of its digits is 180, while the sum is 19.

The square root of 11543131 is about 3397.5183590380. The cubic root of 11543131 is about 225.9997063196. Note that the first 3 decimals are identical.

Adding to 11543131 its reverse (13134511), we get a palindrome (24677642).

The spelling of 11543131 in words is "eleven million, five hundred forty-three thousand, one hundred thirty-one".