423243181 has 2 divisors, whose sum is σ = 423243182. Its totient is φ = 423243180.

The previous prime is 423243179. The next prime is 423243229. The reversal of 423243181 is 181342324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335988900 + 87254281 = 18330^2 + 9341^2 .

It is a cyclic number.

It is not a de Polignac number, because 423243181 - 2¹ = 423243179 is a prime.

It is a super-2 number, since 2×423243181² = 358269580525997522, which contains 22 as substring.

Together with 423243179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423243151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211621590 + 211621591.

It is an arithmetic number, because the mean of its divisors is an integer number (211621591).

Almost surely, 2^423243181 is an apocalyptic number.

It is an amenable number.

423243181 is a deficient number, since it is larger than the sum of its proper divisors (1).

423243181 is an equidigital number, since it uses as much as digits as its factorization.

423243181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 423243181 is about 20572.8748841770. The cubic root of 423243181 is about 750.8098990292.

The spelling of 423243181 in words is "four hundred twenty-three million, two hundred forty-three thousand, one hundred eighty-one".