36669821 has 2 divisors, whose sum is σ = 36669822. Its totient is φ = 36669820.

The previous prime is 36669817. The next prime is 36669847. The reversal of 36669821 is 12896663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32649796 + 4020025 = 5714^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 36669821 - 2² = 36669817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36669881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18334910 + 18334911.

It is an arithmetic number, because the mean of its divisors is an integer number (18334911).

Almost surely, 2^36669821 is an apocalyptic number.

It is an amenable number.

36669821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36669821 is an equidigital number, since it uses as much as digits as its factorization.

36669821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 36669821 is about 6055.5611630963. The cubic root of 36669821 is about 332.2280241481.

The spelling of 36669821 in words is "thirty-six million, six hundred sixty-nine thousand, eight hundred twenty-one".