36003661 has 2 divisors, whose sum is σ = 36003662. Its totient is φ = 36003660.

The previous prime is 36003659. The next prime is 36003683. The reversal of 36003661 is 16630063.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35928036 + 75625 = 5994^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 36003661 - 2¹ = 36003659 is a prime.

Together with 36003659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36003061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18001830 + 18001831.

It is an arithmetic number, because the mean of its divisors is an integer number (18001831).

Almost surely, 2^36003661 is an apocalyptic number.

It is an amenable number.

36003661 is a deficient number, since it is larger than the sum of its proper divisors (1).

36003661 is an equidigital number, since it uses as much as digits as its factorization.

36003661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 36003661 is about 6000.3050755774. The cubic root of 36003661 is about 330.2039174320.

The spelling of 36003661 in words is "thirty-six million, three thousand, six hundred sixty-one".