9811213 has 2 divisors, whose sum is σ = 9811214. Its totient is φ = 9811212.

The previous prime is 9811183. The next prime is 9811229. The reversal of 9811213 is 3121189.

9811213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7856809 + 1954404 = 2803^2 + 1398^2 .

It is an emirp because it is prime and its reverse (3121189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9811213 - 2²¹ = 7714061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9811313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905606 + 4905607.

It is an arithmetic number, because the mean of its divisors is an integer number (4905607).

Almost surely, 2^9811213 is an apocalyptic number.

It is an amenable number.

9811213 is a deficient number, since it is larger than the sum of its proper divisors (1).

9811213 is an equidigital number, since it uses as much as digits as its factorization.

9811213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 25.

The square root of 9811213 is about 3132.2855872350. The cubic root of 9811213 is about 214.0790824847.

It can be divided in two parts, 98 and 11213, that added together give a palindrome (11311).

The spelling of 9811213 in words is "nine million, eight hundred eleven thousand, two hundred thirteen".