42905081 has 2 divisors, whose sum is σ = 42905082. Its totient is φ = 42905080.

The previous prime is 42905069. The next prime is 42905111. The reversal of 42905081 is 18050924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29800681 + 13104400 = 5459^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 42905081 - 2⁶ = 42905017 is a prime.

It is a super-2 number, since 2×42905081² = 3681691951233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42905011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452540 + 21452541.

It is an arithmetic number, because the mean of its divisors is an integer number (21452541).

Almost surely, 2^42905081 is an apocalyptic number.

It is an amenable number.

42905081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42905081 is an equidigital number, since it uses as much as digits as its factorization.

42905081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 42905081 is about 6550.1970199376. The cubic root of 42905081 is about 350.0818339260.

The spelling of 42905081 in words is "forty-two million, nine hundred five thousand, eighty-one".