11852581 has 4 divisors (see below), whose sum is σ = 12764332. Its totient is φ = 10940832.

The previous prime is 11852579. The next prime is 11852591. The reversal of 11852581 is 18525811.

It is the 1406-th star number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18525811 = 167 ⋅110933.

It can be written as a sum of positive squares in 2 ways, for example, as 2030625 + 9821956 = 1425^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 11852581 - 2¹ = 11852579 is a prime.

It is a super-2 number, since 2×11852581² = 280967352723122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11852531) 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 in 3 ways as a sum of consecutive naturals, for example, 455856 + ... + 455881.

It is an arithmetic number, because the mean of its divisors is an integer number (3191083).

Almost surely, 2^11852581 is an apocalyptic number.

It is an amenable number.

11852581 is a deficient number, since it is larger than the sum of its proper divisors (911751).

11852581 is an equidigital number, since it uses as much as digits as its factorization.

11852581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911750.

The product of its digits is 3200, while the sum is 31.

The square root of 11852581 is about 3442.7577608656. The cubic root of 11852581 is about 228.0014683911.

The spelling of 11852581 in words is "eleven million, eight hundred fifty-two thousand, five hundred eighty-one".