42645161 has 8 divisors (see below), whose sum is σ = 46679304. Its totient is φ = 38718720.

The previous prime is 42645137. The next prime is 42645173. The reversal of 42645161 is 16154624.

42645161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7123561 + 35521600 = 2669^2 + 5960^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42645161 - 2¹⁰ = 42644137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42645131) 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 7 ways as a sum of consecutive naturals, for example, 26096 + ... + 27681.

It is an arithmetic number, because the mean of its divisors is an integer number (5834913).

Almost surely, 2^42645161 is an apocalyptic number.

It is an amenable number.

42645161 is a deficient number, since it is larger than the sum of its proper divisors (4034143).

42645161 is a wasteful number, since it uses less digits than its factorization.

42645161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53851.

The product of its digits is 5760, while the sum is 29.

The square root of 42645161 is about 6530.3262552494. The cubic root of 42645161 is about 349.3734668707.

Adding to 42645161 its reverse (16154624), we get a palindrome (58799785).

The spelling of 42645161 in words is "forty-two million, six hundred forty-five thousand, one hundred sixty-one".