42070081 has 2 divisors, whose sum is σ = 42070082. Its totient is φ = 42070080.

The previous prime is 42070057. The next prime is 42070099. The reversal of 42070081 is 18007024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 6548481 = 5960^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 42070081 - 2¹³ = 42061889 is a prime.

It is a super-2 number, since 2×42070081² = 3539783430693122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42070031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21035040 + 21035041.

It is an arithmetic number, because the mean of its divisors is an integer number (21035041).

Almost surely, 2^42070081 is an apocalyptic number.

It is an amenable number.

42070081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42070081 is an equidigital number, since it uses as much as digits as its factorization.

42070081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 42070081 is about 6486.1453113540. The cubic root of 42070081 is about 347.7958931053.

The spelling of 42070081 in words is "forty-two million, seventy thousand, eighty-one".