11531087 has 6 divisors (see below), whose sum is σ = 11852568. Its totient is φ = 11218104.

The previous prime is 11531059. The next prime is 11531099. The reversal of 11531087 is 78013511.

It is a de Polignac number, because none of the positive numbers 2^k-11531087 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 (11531017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2843 + ... + 5580.

It is an arithmetic number, because the mean of its divisors is an integer number (1975428).

Almost surely, 2^11531087 is an apocalyptic number.

11531087 is a deficient number, since it is larger than the sum of its proper divisors (321481).

11531087 is an frugal number, since it uses more digits than its factorization.

11531087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8497 (or 8460 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 11531087 is about 3395.7454262650. The cubic root of 11531087 is about 225.9210769398.

Adding to 11531087 its reverse (78013511), we get a palindrome (89544598).

The spelling of 11531087 in words is "eleven million, five hundred thirty-one thousand, eighty-seven".