36005621 has 4 divisors (see below), whose sum is σ = 36028044. Its totient is φ = 35983200.

The previous prime is 36005581. The next prime is 36005633. The reversal of 36005621 is 12650063.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1030225 + 34975396 = 1015^2 + 5914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36005621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36025621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8600 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (9007011).

Almost surely, 2^36005621 is an apocalyptic number.

It is an amenable number.

36005621 is a deficient number, since it is larger than the sum of its proper divisors (22423).

36005621 is a wasteful number, since it uses less digits than its factorization.

36005621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22422.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 36005621 is about 6000.4683983836. The cubic root of 36005621 is about 330.2099093035.

Adding to 36005621 its reverse (12650063), we get a palindrome (48655684).

The spelling of 36005621 in words is "thirty-six million, five thousand, six hundred twenty-one".