36561001 has 4 divisors (see below), whose sum is σ = 36576900. Its totient is φ = 36545104.

The previous prime is 36560981. The next prime is 36561011. The reversal of 36561001 is 10016563.

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 18490000 + 18071001 = 4300^2 + 4251^2 .

It is a cyclic number.

It is not a de Polignac number, because 36561001 - 2¹¹ = 36558953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36561011) 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, 3766 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (9144225).

Almost surely, 2^36561001 is an apocalyptic number.

It is an amenable number.

36561001 is a deficient number, since it is larger than the sum of its proper divisors (15899).

36561001 is a wasteful number, since it uses less digits than its factorization.

36561001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15898.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 36561001 is about 6046.5693579087. The cubic root of 36561001 is about 331.8990626767.

Adding to 36561001 its reverse (10016563), we get a palindrome (46577564).

It can be divided in two parts, 36 and 561001, that multiplied together give a square (20196036 = 4494²).

The spelling of 36561001 in words is "thirty-six million, five hundred sixty-one thousand, one".