36228581 has 4 divisors (see below), whose sum is σ = 38359692. Its totient is φ = 34097472.

The previous prime is 36228559. The next prime is 36228583. The reversal of 36228581 is 18582263.

36228581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18582263 = 7 ⋅2654609.

It can be written as a sum of positive squares in 2 ways, for example, as 33166081 + 3062500 = 5759^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 36228581 - 2¹⁰ = 36227557 is a prime.

It is a super-3 number, since 3×36228581³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36228583) 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, 1065530 + ... + 1065563.

It is an arithmetic number, because the mean of its divisors is an integer number (9589923).

Almost surely, 2^36228581 is an apocalyptic number.

It is an amenable number.

36228581 is a deficient number, since it is larger than the sum of its proper divisors (2131111).

36228581 is a wasteful number, since it uses less digits than its factorization.

36228581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131110.

The product of its digits is 23040, while the sum is 35.

The square root of 36228581 is about 6019.0182754333. The cubic root of 36228581 is about 330.8901008207.

The spelling of 36228581 in words is "thirty-six million, two hundred twenty-eight thousand, five hundred eighty-one".