42732161 has 4 divisors (see below), whose sum is σ = 42898692. Its totient is φ = 42565632.

The previous prime is 42732143. The next prime is 42732163. The reversal of 42732161 is 16123724.

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 33466225 + 9265936 = 5785^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 42732161 - 2⁶ = 42732097 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 42732161.

It is not an unprimeable number, because it can be changed into a prime (42732163) 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, 82880 + ... + 83393.

It is an arithmetic number, because the mean of its divisors is an integer number (10724673).

Almost surely, 2^42732161 is an apocalyptic number.

It is an amenable number.

42732161 is a deficient number, since it is larger than the sum of its proper divisors (166531).

42732161 is a wasteful number, since it uses less digits than its factorization.

42732161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166530.

The product of its digits is 2016, while the sum is 26.

The square root of 42732161 is about 6536.9840905421. The cubic root of 42732161 is about 349.6108900191.

Adding to 42732161 its reverse (16123724), we get a palindrome (58855885).

The spelling of 42732161 in words is "forty-two million, seven hundred thirty-two thousand, one hundred sixty-one".