42306181 has 2 divisors, whose sum is σ = 42306182. Its totient is φ = 42306180.

The previous prime is 42306169. The next prime is 42306197. The reversal of 42306181 is 18160324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41809156 + 497025 = 6466^2 + 705^2 .

It is a cyclic number.

It is not a de Polignac number, because 42306181 - 2⁷ = 42306053 is a prime.

It is a super-2 number, since 2×42306181² = 3579625901609522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42306101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21153090 + 21153091.

It is an arithmetic number, because the mean of its divisors is an integer number (21153091).

Almost surely, 2^42306181 is an apocalyptic number.

It is an amenable number.

42306181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42306181 is an equidigital number, since it uses as much as digits as its factorization.

42306181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 42306181 is about 6504.3201796960. The cubic root of 42306181 is about 348.4452974225.

The spelling of 42306181 in words is "forty-two million, three hundred six thousand, one hundred eighty-one".