11321531 has 8 divisors (see below), whose sum is σ = 12248880. Its totient is φ = 10402272.

The previous prime is 11321521. The next prime is 11321533. The reversal of 11321531 is 13512311.

11321531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11321531 is a prime.

It is a super-2 number, since 2×11321531² = 256354128367922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11321533) 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, 1076 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (1531110).

Almost surely, 2^11321531 is an apocalyptic number.

11321531 is a deficient number, since it is larger than the sum of its proper divisors (927349).

11321531 is a wasteful number, since it uses less digits than its factorization.

11321531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045.

The product of its digits is 90, while the sum is 17.

The square root of 11321531 is about 3364.7482818184. The cubic root of 11321531 is about 224.5441371017.

Adding to 11321531 its reverse (13512311), we get a palindrome (24833842).

The spelling of 11321531 in words is "eleven million, three hundred twenty-one thousand, five hundred thirty-one".