11531071 has 4 divisors (see below), whose sum is σ = 11538112. Its totient is φ = 11524032.

The previous prime is 11531059. The next prime is 11531099. The reversal of 11531071 is 17013511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11531071 - 2⁹ = 11530559 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 (11531011) 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, 370 + ... + 4816.

It is an arithmetic number, because the mean of its divisors is an integer number (2884528).

Almost surely, 2^11531071 is an apocalyptic number.

11531071 is a deficient number, since it is larger than the sum of its proper divisors (7041).

11531071 is an equidigital number, since it uses as much as digits as its factorization.

11531071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040.

The product of its (nonzero) digits is 105, while the sum is 19.

The square root of 11531071 is about 3395.7430703750. The cubic root of 11531071 is about 225.9209724472.

Adding to 11531071 its reverse (17013511), we get a palindrome (28544582).

The spelling of 11531071 in words is "eleven million, five hundred thirty-one thousand, seventy-one".