42905171 has 2 divisors, whose sum is σ = 42905172. Its totient is φ = 42905170.

The previous prime is 42905141. The next prime is 42905179. The reversal of 42905171 is 17150924.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42905171 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42905179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452585 + 21452586.

It is an arithmetic number, because the mean of its divisors is an integer number (21452586).

Almost surely, 2^42905171 is an apocalyptic number.

42905171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42905171 is an equidigital number, since it uses as much as digits as its factorization.

42905171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 42905171 is about 6550.2038899564. The cubic root of 42905171 is about 350.0820787094.

The spelling of 42905171 in words is "forty-two million, nine hundred five thousand, one hundred seventy-one".