42179281 has 4 divisors (see below), whose sum is σ = 42363700. Its totient is φ = 41994864.

The previous prime is 42179273. The next prime is 42179321. The reversal of 42179281 is 18297124.

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 33535681 + 8643600 = 5791^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 42179281 - 2³ = 42179273 is a prime.

It is a super-2 number, since 2×42179281² = 3558183491353922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42179231) 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, 91866 + ... + 92323.

It is an arithmetic number, because the mean of its divisors is an integer number (10590925).

Almost surely, 2^42179281 is an apocalyptic number.

It is an amenable number.

42179281 is a deficient number, since it is larger than the sum of its proper divisors (184419).

42179281 is a wasteful number, since it uses less digits than its factorization.

42179281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184418.

The product of its digits is 8064, while the sum is 34.

The square root of 42179281 is about 6494.5577986496. The cubic root of 42179281 is about 348.0965541083.

The spelling of 42179281 in words is "forty-two million, one hundred seventy-nine thousand, two hundred eighty-one".