42781165 has 12 divisors (see below), whose sum is σ = 59719356. Its totient is φ = 29335488.

The previous prime is 42781159. The next prime is 42781181. The reversal of 42781165 is 56118724.

It can be written as a sum of positive squares in 2 ways, for example, as 16597476 + 26183689 = 4074^2 + 5117^2 .

It is not a de Polignac number, because 42781165 - 2¹³ = 42772973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42781165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87064 + ... + 87553.

It is an arithmetic number, because the mean of its divisors is an integer number (4976613).

Almost surely, 2^42781165 is an apocalyptic number.

It is an amenable number.

42781165 is a deficient number, since it is larger than the sum of its proper divisors (16938191).

42781165 is a wasteful number, since it uses less digits than its factorization.

42781165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174636 (or 174629 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 42781165 is about 6540.7312282343. The cubic root of 42781165 is about 349.7444801681.

Adding to 42781165 its reverse (56118724), we get a palindrome (98899889).

The spelling of 42781165 in words is "forty-two million, seven hundred eighty-one thousand, one hundred sixty-five".