42171791 has 2 divisors, whose sum is σ = 42171792. Its totient is φ = 42171790.

The previous prime is 42171769. The next prime is 42171809. The reversal of 42171791 is 19717124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42171791 - 2¹⁰ = 42170767 is a prime.

It is a super-2 number, since 2×42171791² = 3556919912295362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42171721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21085895 + 21085896.

It is an arithmetic number, because the mean of its divisors is an integer number (21085896).

Almost surely, 2^42171791 is an apocalyptic number.

42171791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42171791 is an equidigital number, since it uses as much as digits as its factorization.

42171791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 32.

The square root of 42171791 is about 6493.9811364062. The cubic root of 42171791 is about 348.0759484344.

The spelling of 42171791 in words is "forty-two million, one hundred seventy-one thousand, seven hundred ninety-one".