42082081 has 2 divisors, whose sum is σ = 42082082. Its totient is φ = 42082080.

The previous prime is 42082069. The next prime is 42082099. The reversal of 42082081 is 18028024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26010000 + 16072081 = 5100^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 42082081 - 2⁵ = 42082049 is a prime.

It is a super-2 number, since 2×42082081² = 3541803082581122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42082181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21041040 + 21041041.

It is an arithmetic number, because the mean of its divisors is an integer number (21041041).

Almost surely, 2^42082081 is an apocalyptic number.

It is an amenable number.

42082081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42082081 is an equidigital number, since it uses as much as digits as its factorization.

42082081 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 25.

The square root of 42082081 is about 6487.0702940542. The cubic root of 42082081 is about 347.8289582025.

The spelling of 42082081 in words is "forty-two million, eighty-two thousand, eighty-one".