42831161 has 4 divisors (see below), whose sum is σ = 43312500. Its totient is φ = 42349824.

The previous prime is 42831133. The next prime is 42831197. The reversal of 42831161 is 16113824.

42831161 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 can be written as a sum of positive squares in 2 ways, for example, as 8667136 + 34164025 = 2944^2 + 5845^2 .

It is a cyclic number.

It is not a de Polignac number, because 42831161 - 2⁶ = 42831097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42831161.

It is not an unprimeable number, because it can be changed into a prime (42831361) 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, 240536 + ... + 240713.

It is an arithmetic number, because the mean of its divisors is an integer number (10828125).

Almost surely, 2^42831161 is an apocalyptic number.

It is an amenable number.

42831161 is a deficient number, since it is larger than the sum of its proper divisors (481339).

42831161 is an equidigital number, since it uses as much as digits as its factorization.

42831161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481338.

The product of its digits is 1152, while the sum is 26.

The square root of 42831161 is about 6544.5520091141. The cubic root of 42831161 is about 349.8806695237.

Adding to 42831161 its reverse (16113824), we get a palindrome (58944985).

The spelling of 42831161 in words is "forty-two million, eight hundred thirty-one thousand, one hundred sixty-one".