42781171 has 4 divisors (see below), whose sum is σ = 43222312. Its totient is φ = 42340032.

The previous prime is 42781159. The next prime is 42781181. The reversal of 42781171 is 17118724.

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

It is a cyclic number.

It is not a de Polignac number, because 42781171 - 2⁷ = 42781043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42781181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220425 + ... + 220618.

It is an arithmetic number, because the mean of its divisors is an integer number (10805578).

Almost surely, 2^42781171 is an apocalyptic number.

42781171 is a deficient number, since it is larger than the sum of its proper divisors (441141).

42781171 is an equidigital number, since it uses as much as digits as its factorization.

42781171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441140.

The product of its digits is 3136, while the sum is 31.

The square root of 42781171 is about 6540.7316868986. The cubic root of 42781171 is about 349.7444965185.

Adding to 42781171 its reverse (17118724), we get a palindrome (59899895).

The spelling of 42781171 in words is "forty-two million, seven hundred eighty-one thousand, one hundred seventy-one".