36819721 has 2 divisors, whose sum is σ = 36819722. Its totient is φ = 36819720.

The previous prime is 36819707. The next prime is 36819749. The reversal of 36819721 is 12791863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21492496 + 15327225 = 4636^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 36819721 - 2⁷ = 36819593 is a prime.

It is not a weakly prime, because it can be changed into another prime (36819751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18409860 + 18409861.

It is an arithmetic number, because the mean of its divisors is an integer number (18409861).

Almost surely, 2^36819721 is an apocalyptic number.

It is an amenable number.

36819721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36819721 is an equidigital number, since it uses as much as digits as its factorization.

36819721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 36819721 is about 6067.9255928200. The cubic root of 36819721 is about 332.6801059403.

The spelling of 36819721 in words is "thirty-six million, eight hundred nineteen thousand, seven hundred twenty-one".