9890813 has 2 divisors, whose sum is σ = 9890814. Its totient is φ = 9890812.

The previous prime is 9890791. The next prime is 9890833. The reversal of 9890813 is 3180989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7991929 + 1898884 = 2827^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 9890813 - 2¹² = 9886717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9890833) 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, 4945406 + 4945407.

It is an arithmetic number, because the mean of its divisors is an integer number (4945407).

Almost surely, 2^9890813 is an apocalyptic number.

It is an amenable number.

9890813 is a deficient number, since it is larger than the sum of its proper divisors (1).

9890813 is an equidigital number, since it uses as much as digits as its factorization.

9890813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 9890813 is about 3144.9662955269. The cubic root of 9890813 is about 214.6564768363.

The spelling of 9890813 in words is "nine million, eight hundred ninety thousand, eight hundred thirteen".