11581331 has 2 divisors, whose sum is σ = 11581332. Its totient is φ = 11581330.

The previous prime is 11581261. The next prime is 11581337. The reversal of 11581331 is 13318511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11581331 - 2¹⁰ = 11580307 is a prime.

It is a super-2 number, since 2×11581331² = 268254455463122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11581297 and 11581306.

It is not a weakly prime, because it can be changed into another prime (11581337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5790665 + 5790666.

It is an arithmetic number, because the mean of its divisors is an integer number (5790666).

Almost surely, 2^11581331 is an apocalyptic number.

11581331 is a deficient number, since it is larger than the sum of its proper divisors (1).

11581331 is an equidigital number, since it uses as much as digits as its factorization.

11581331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 11581331 is about 3403.1354660078. The cubic root of 11581331 is about 226.2487341585.

Adding to 11581331 its reverse (13318511), we get a palindrome (24899842).

The spelling of 11581331 in words is "eleven million, five hundred eighty-one thousand, three hundred thirty-one".