42242161 has 8 divisors (see below), whose sum is σ = 48167784. Its totient is φ = 36698880.

The previous prime is 42242153. The next prime is 42242173. The reversal of 42242161 is 16124224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11771761 + 30470400 = 3431^2 + 5520^2 .

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 42242161 - 2³ = 42242153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42242141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95350 + ... + 95791.

It is an arithmetic number, because the mean of its divisors is an integer number (6020973).

Almost surely, 2^42242161 is an apocalyptic number.

It is an amenable number.

42242161 is a deficient number, since it is larger than the sum of its proper divisors (5925623).

42242161 is a wasteful number, since it uses less digits than its factorization.

42242161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191171.

The product of its digits is 768, while the sum is 22.

The square root of 42242161 is about 6499.3969720275. The cubic root of 42242161 is about 348.2694466037.

Adding to 42242161 its reverse (16124224), we get a palindrome (58366385).

The spelling of 42242161 in words is "forty-two million, two hundred forty-two thousand, one hundred sixty-one".