423207181 has 2 divisors, whose sum is σ = 423207182. Its totient is φ = 423207180.

The previous prime is 423207137. The next prime is 423207227. The reversal of 423207181 is 181702324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277522281 + 145684900 = 16659^2 + 12070^2 .

It is a cyclic number.

It is not a de Polignac number, because 423207181 - 2⁹ = 423206669 is a prime.

It is a super-2 number, since 2×423207181² = 358208636099933522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423207101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211603590 + 211603591.

It is an arithmetic number, because the mean of its divisors is an integer number (211603591).

Almost surely, 2^423207181 is an apocalyptic number.

It is an amenable number.

423207181 is a deficient number, since it is larger than the sum of its proper divisors (1).

423207181 is an equidigital number, since it uses as much as digits as its factorization.

423207181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 423207181 is about 20571.9999270854. Note that the first 4 decimals coincide. The cubic root of 423207181 is about 750.7886110920.

The spelling of 423207181 in words is "four hundred twenty-three million, two hundred seven thousand, one hundred eighty-one".