42161771 has 4 divisors (see below), whose sum is σ = 42210192. Its totient is φ = 42113352.

The previous prime is 42161723. The next prime is 42161803. The reversal of 42161771 is 17716124.

42161771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42161771 is a prime.

It is a super-2 number, since 2×42161771² = 3555229867712882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42161971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22880 + ... + 24653.

It is an arithmetic number, because the mean of its divisors is an integer number (10552548).

Almost surely, 2^42161771 is an apocalyptic number.

42161771 is a deficient number, since it is larger than the sum of its proper divisors (48421).

42161771 is an equidigital number, since it uses as much as digits as its factorization.

42161771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48420.

The product of its digits is 2352, while the sum is 29.

The square root of 42161771 is about 6493.2096069663. The cubic root of 42161771 is about 348.0483786839.

Adding to 42161771 its reverse (17716124), we get a palindrome (59877895).

The spelling of 42161771 in words is "forty-two million, one hundred sixty-one thousand, seven hundred seventy-one".