7123213 has 2 divisors, whose sum is σ = 7123214. Its totient is φ = 7123212.

The previous prime is 7123201. The next prime is 7123223. The reversal of 7123213 is 3123217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5322249 + 1800964 = 2307^2 + 1342^2 .

It is an emirp because it is prime and its reverse (3123217) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7123213 is a prime.

7123213 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7123223) 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, 3561606 + 3561607.

It is an arithmetic number, because the mean of its divisors is an integer number (3561607).

Almost surely, 2^7123213 is an apocalyptic number.

It is an amenable number.

7123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

7123213 is an equidigital number, since it uses as much as digits as its factorization.

7123213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 19.

The square root of 7123213 is about 2668.9348062476. The cubic root of 7123213 is about 192.4089680339.

The spelling of 7123213 in words is "seven million, one hundred twenty-three thousand, two hundred thirteen".