42870181 has 2 divisors, whose sum is σ = 42870182. Its totient is φ = 42870180.

The previous prime is 42870173. The next prime is 42870197. The reversal of 42870181 is 18107824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 13439556 = 5425^2 + 3666^2 .

It is a cyclic number.

It is not a de Polignac number, because 42870181 - 2³ = 42870173 is a prime.

It is a super-2 number, since 2×42870181² = 3675704837945522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42870101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21435090 + 21435091.

It is an arithmetic number, because the mean of its divisors is an integer number (21435091).

Almost surely, 2^42870181 is an apocalyptic number.

It is an amenable number.

42870181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42870181 is an equidigital number, since it uses as much as digits as its factorization.

42870181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 42870181 is about 6547.5324359639. The cubic root of 42870181 is about 349.9868865835.

The spelling of 42870181 in words is "forty-two million, eight hundred seventy thousand, one hundred eighty-one".