420015181 has 2 divisors, whose sum is σ = 420015182. Its totient is φ = 420015180.

The previous prime is 420015131. The next prime is 420015199. The reversal of 420015181 is 181510024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291555625 + 128459556 = 17075^2 + 11334^2 .

It is a cyclic number.

It is not a de Polignac number, because 420015181 - 2⁷ = 420015053 is a prime.

It is a super-2 number, since 2×420015181² = 352825504540925522, which contains 22 as substring.

It is equal to p_22345240 and since 420015181 and 22345240 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420015131) 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, 210007590 + 210007591.

It is an arithmetic number, because the mean of its divisors is an integer number (210007591).

Almost surely, 2^420015181 is an apocalyptic number.

It is an amenable number.

420015181 is a deficient number, since it is larger than the sum of its proper divisors (1).

420015181 is an equidigital number, since it uses as much as digits as its factorization.

420015181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 420015181 is about 20494.2719070476. The cubic root of 420015181 is about 748.8962615157.

The spelling of 420015181 in words is "four hundred twenty million, fifteen thousand, one hundred eighty-one".