42057181 has 2 divisors, whose sum is σ = 42057182. Its totient is φ = 42057180.

The previous prime is 42057161. The next prime is 42057233. The reversal of 42057181 is 18175024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27994681 + 14062500 = 5291^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 42057181 - 2⁵ = 42057149 is a prime.

It is a super-2 number, since 2×42057181² = 3537612947333522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42057101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21028590 + 21028591.

It is an arithmetic number, because the mean of its divisors is an integer number (21028591).

Almost surely, 2^42057181 is an apocalyptic number.

It is an amenable number.

42057181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42057181 is an equidigital number, since it uses as much as digits as its factorization.

42057181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 42057181 is about 6485.1508078070. The cubic root of 42057181 is about 347.7603411123.

The spelling of 42057181 in words is "forty-two million, fifty-seven thousand, one hundred eighty-one".