890021801 has 2 divisors, whose sum is σ = 890021802. Its totient is φ = 890021800.

The previous prime is 890021789. The next prime is 890021819. The reversal of 890021801 is 108120098.

890021801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706283776 + 183738025 = 26576^2 + 13555^2 .

It is a cyclic number.

It is not a de Polignac number, because 890021801 - 2¹⁸ = 889759657 is a prime.

It is not a weakly prime, because it can be changed into another prime (890021101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445010900 + 445010901.

It is an arithmetic number, because the mean of its divisors is an integer number (445010901).

Almost surely, 2^890021801 is an apocalyptic number.

It is an amenable number.

890021801 is a deficient number, since it is larger than the sum of its proper divisors (1).

890021801 is an equidigital number, since it uses as much as digits as its factorization.

890021801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 890021801 is about 29833.2331637052. The cubic root of 890021801 is about 961.9080256206.

Adding to 890021801 its reverse (108120098), we get a palindrome (998141899).

The spelling of 890021801 in words is "eight hundred ninety million, twenty-one thousand, eight hundred one".