42280181 has 2 divisors, whose sum is σ = 42280182. Its totient is φ = 42280180.

The previous prime is 42280177. The next prime is 42280201. The reversal of 42280181 is 18108224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38316100 + 3964081 = 6190^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 42280181 - 2² = 42280177 is a prime.

It is a super-2 number, since 2×42280181² = 3575227410785522, which contains 22 as substring.

It is equal to p_2563640 and since 42280181 and 2563640 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42280181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42280171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21140090 + 21140091.

It is an arithmetic number, because the mean of its divisors is an integer number (21140091).

Almost surely, 2^42280181 is an apocalyptic number.

It is an amenable number.

42280181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42280181 is an equidigital number, since it uses as much as digits as its factorization.

42280181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 42280181 is about 6502.3212009251. The cubic root of 42280181 is about 348.3739017536.

The spelling of 42280181 in words is "forty-two million, two hundred eighty thousand, one hundred eighty-one".