420423181 has 2 divisors, whose sum is σ = 420423182. Its totient is φ = 420423180.

The previous prime is 420423151. The next prime is 420423217. The reversal of 420423181 is 181324024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388681225 + 31741956 = 19715^2 + 5634^2 .

It is a cyclic number.

It is not a de Polignac number, because 420423181 - 2⁵ = 420423149 is a prime.

It is a super-2 number, since 2×420423181² = 353511302244317522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420423151) 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, 210211590 + 210211591.

It is an arithmetic number, because the mean of its divisors is an integer number (210211591).

Almost surely, 2^420423181 is an apocalyptic number.

It is an amenable number.

420423181 is a deficient number, since it is larger than the sum of its proper divisors (1).

420423181 is an equidigital number, since it uses as much as digits as its factorization.

420423181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 420423181 is about 20504.2234917590. The cubic root of 420423181 is about 749.1386740169.

The spelling of 420423181 in words is "four hundred twenty million, four hundred twenty-three thousand, one hundred eighty-one".