42049171 has 2 divisors, whose sum is σ = 42049172. Its totient is φ = 42049170.

The previous prime is 42049169. The next prime is 42049243. The reversal of 42049171 is 17194024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42049171 - 2¹ = 42049169 is a prime.

Together with 42049169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42089171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21024585 + 21024586.

It is an arithmetic number, because the mean of its divisors is an integer number (21024586).

Almost surely, 2^42049171 is an apocalyptic number.

42049171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42049171 is an equidigital number, since it uses as much as digits as its factorization.

42049171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 42049171 is about 6484.5332137325. The cubic root of 42049171 is about 347.7382621464.

The spelling of 42049171 in words is "forty-two million, forty-nine thousand, one hundred seventy-one".