64083821 has 2 divisors, whose sum is σ = 64083822. Its totient is φ = 64083820.

The previous prime is 64083809. The next prime is 64083839. The reversal of 64083821 is 12838046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32330596 + 31753225 = 5686^2 + 5635^2 .

It is a cyclic number.

It is not a de Polignac number, because 64083821 - 2⁶ = 64083757 is a prime.

It is a super-2 number, since 2×64083821² = 8213472227920082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64083121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32041910 + 32041911.

It is an arithmetic number, because the mean of its divisors is an integer number (32041911).

Almost surely, 2^64083821 is an apocalyptic number.

It is an amenable number.

64083821 is a deficient number, since it is larger than the sum of its proper divisors (1).

64083821 is an equidigital number, since it uses as much as digits as its factorization.

64083821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 64083821 is about 8005.2370983001. The cubic root of 64083821 is about 400.1745509022.

The spelling of 64083821 in words is "sixty-four million, eighty-three thousand, eight hundred twenty-one".