11873581 has 2 divisors, whose sum is σ = 11873582. Its totient is φ = 11873580.

The previous prime is 11873567. The next prime is 11873591. The reversal of 11873581 is 18537811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 81225 = 3434^2 + 285^2 .

It is an emirp because it is prime and its reverse (18537811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11873581 - 2¹⁵ = 11840813 is a prime.

It is a super-2 number, since 2×11873581² = 281963851527122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11873501) 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, 5936790 + 5936791.

It is an arithmetic number, because the mean of its divisors is an integer number (5936791).

Almost surely, 2^11873581 is an apocalyptic number.

It is an amenable number.

11873581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11873581 is an equidigital number, since it uses as much as digits as its factorization.

11873581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 34.

The square root of 11873581 is about 3445.8062917117. The cubic root of 11873581 is about 228.1360440265.

The spelling of 11873581 in words is "eleven million, eight hundred seventy-three thousand, five hundred eighty-one".