36653621 has 4 divisors (see below), whose sum is σ = 36665772. Its totient is φ = 36641472.

The previous prime is 36653579. The next prime is 36653627. The reversal of 36653621 is 12635663.

36653621 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12635663 = 2971 ⋅4253.

It can be written as a sum of positive squares in 2 ways, for example, as 20340100 + 16313521 = 4510^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 36653621 - 2⁶ = 36653557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36653627) 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, 2285 + ... + 8861.

It is an arithmetic number, because the mean of its divisors is an integer number (9166443).

Almost surely, 2^36653621 is an apocalyptic number.

It is an amenable number.

36653621 is a deficient number, since it is larger than the sum of its proper divisors (12151).

36653621 is an equidigital number, since it uses as much as digits as its factorization.

36653621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12150.

The product of its digits is 19440, while the sum is 32.

The square root of 36653621 is about 6054.2234018906. The cubic root of 36653621 is about 332.1790930234.

The spelling of 36653621 in words is "thirty-six million, six hundred fifty-three thousand, six hundred twenty-one".