42800161 has 4 divisors (see below), whose sum is σ = 42813252. Its totient is φ = 42787072.

The previous prime is 42800159. The next prime is 42800207. The reversal of 42800161 is 16100824.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 22043025 = 4556^2 + 4695^2 .

It is a cyclic number.

It is not a de Polignac number, because 42800161 - 2¹ = 42800159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42800111) 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, 2985 + ... + 9721.

It is an arithmetic number, because the mean of its divisors is an integer number (10703313).

Almost surely, 2^42800161 is an apocalyptic number.

It is an amenable number.

42800161 is a deficient number, since it is larger than the sum of its proper divisors (13091).

42800161 is an equidigital number, since it uses as much as digits as its factorization.

42800161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13090.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 42800161 is about 6542.1831982909. The cubic root of 42800161 is about 349.7962378599.

Adding to 42800161 its reverse (16100824), we get a palindrome (58900985).

The spelling of 42800161 in words is "forty-two million, eight hundred thousand, one hundred sixty-one".