42255181 has 2 divisors, whose sum is σ = 42255182. Its totient is φ = 42255180.

The previous prime is 42255131. The next prime is 42255223. The reversal of 42255181 is 18155224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40525956 + 1729225 = 6366^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 42255181 - 2⁷ = 42255053 is a prime.

It is a super-2 number, since 2×42255181² = 3571000642685522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42255131) 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, 21127590 + 21127591.

It is an arithmetic number, because the mean of its divisors is an integer number (21127591).

Almost surely, 2^42255181 is an apocalyptic number.

It is an amenable number.

42255181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42255181 is an equidigital number, since it uses as much as digits as its factorization.

42255181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 28.

The square root of 42255181 is about 6500.3985262444. The cubic root of 42255181 is about 348.3052244640.

It can be divided in two parts, 42255 and 181, that added together give a square (42436 = 206²).

The spelling of 42255181 in words is "forty-two million, two hundred fifty-five thousand, one hundred eighty-one".