42536281 has 4 divisors (see below), whose sum is σ = 42576292. Its totient is φ = 42496272.

The previous prime is 42536239. The next prime is 42536287. The reversal of 42536281 is 18263524.

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 25857225 + 16679056 = 5085^2 + 4084^2 .

It is a cyclic number.

It is not a de Polignac number, because 42536281 - 2⁹ = 42535769 is a prime.

It is a super-2 number, since 2×42536281² = 3618670402621922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42536287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18366 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (10644073).

Almost surely, 2^42536281 is an apocalyptic number.

It is an amenable number.

42536281 is a deficient number, since it is larger than the sum of its proper divisors (40011).

42536281 is a wasteful number, since it uses less digits than its factorization.

42536281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40010.

The product of its digits is 11520, while the sum is 31.

The square root of 42536281 is about 6521.9844372706. The cubic root of 42536281 is about 349.0758777884.

The spelling of 42536281 in words is "forty-two million, five hundred thirty-six thousand, two hundred eighty-one".