3636661121 has 4 divisors (see below), whose sum is σ = 3654936000. Its totient is φ = 3618386244.

The previous prime is 3636661111. The next prime is 3636661151. The reversal of 3636661121 is 1211666363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211666363 = 61 ⋅19863383.

It is a cyclic number.

It is not a de Polignac number, because 3636661121 - 2³⁰ = 2562919297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3636661111) 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, 9137141 + ... + 9137538.

It is an arithmetic number, because the mean of its divisors is an integer number (913734000).

Almost surely, 2^3636661121 is an apocalyptic number.

It is an amenable number.

3636661121 is a deficient number, since it is larger than the sum of its proper divisors (18274879).

3636661121 is a wasteful number, since it uses less digits than its factorization.

3636661121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274878.

The product of its digits is 23328, while the sum is 35.

The square root of 3636661121 is about 60304.7354774067. The cubic root of 3636661121 is about 1537.8038523971.

The spelling of 3636661121 in words is "three billion, six hundred thirty-six million, six hundred sixty-one thousand, one hundred twenty-one".