42747181 has 2 divisors, whose sum is σ = 42747182. Its totient is φ = 42747180.

The previous prime is 42747161. The next prime is 42747209. The reversal of 42747181 is 18174724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39175081 + 3572100 = 6259^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 42747181 - 2⁷ = 42747053 is a prime.

It is a super-2 number, since 2×42747181² = 3654642966893522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42747161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21373590 + 21373591.

It is an arithmetic number, because the mean of its divisors is an integer number (21373591).

Almost surely, 2^42747181 is an apocalyptic number.

It is an amenable number.

42747181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42747181 is an equidigital number, since it uses as much as digits as its factorization.

42747181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 34.

The square root of 42747181 is about 6538.1328374391. The cubic root of 42747181 is about 349.6518469964.

The spelling of 42747181 in words is "forty-two million, seven hundred forty-seven thousand, one hundred eighty-one".