3636561 has 4 divisors (see below), whose sum is σ = 4848752. Its totient is φ = 2424372.

The previous prime is 3636551. The next prime is 3636569. The reversal of 3636561 is 1656363.

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.

It is not a de Polignac number, because 3636561 - 2¹¹ = 3634513 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3636561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3636569) 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, 606091 + ... + 606096.

It is an arithmetic number, because the mean of its divisors is an integer number (1212188).

Almost surely, 2^3636561 is an apocalyptic number.

It is an amenable number.

3636561 is a deficient number, since it is larger than the sum of its proper divisors (1212191).

3636561 is a wasteful number, since it uses less digits than its factorization.

3636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212190.

The product of its digits is 9720, while the sum is 30.

The square root of 3636561 is about 1906.9769269711. The cubic root of 3636561 is about 153.7789739830.

The spelling of 3636561 in words is "three million, six hundred thirty-six thousand, five hundred sixty-one".