423172213 has 2 divisors, whose sum is σ = 423172214. Its totient is φ = 423172212.

The previous prime is 423172187. The next prime is 423172271. The reversal of 423172213 is 312271324.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396886084 + 26286129 = 19922^2 + 5127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423172213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423172273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211586106 + 211586107.

It is an arithmetic number, because the mean of its divisors is an integer number (211586107).

Almost surely, 2^423172213 is an apocalyptic number.

It is an amenable number.

423172213 is a deficient number, since it is larger than the sum of its proper divisors (1).

423172213 is an equidigital number, since it uses as much as digits as its factorization.

423172213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 423172213 is about 20571.1500164672. The cubic root of 423172213 is about 750.7679322532.

The spelling of 423172213 in words is "four hundred twenty-three million, one hundred seventy-two thousand, two hundred thirteen".