42182681 has 4 divisors (see below), whose sum is σ = 42617652. Its totient is φ = 41747712.

The previous prime is 42182663. The next prime is 42182687. The reversal of 42182681 is 18628124.

It is a happy number.

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 30349081 + 11833600 = 5509^2 + 3440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42182681 is a prime.

It is a super-2 number, since 2×42182681² = 3558757152695522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42182687) 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, 217340 + ... + 217533.

It is an arithmetic number, because the mean of its divisors is an integer number (10654413).

Almost surely, 2^42182681 is an apocalyptic number.

It is an amenable number.

42182681 is a deficient number, since it is larger than the sum of its proper divisors (434971).

42182681 is an equidigital number, since it uses as much as digits as its factorization.

42182681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434970.

The product of its digits is 6144, while the sum is 32.

The square root of 42182681 is about 6494.8195509960. The cubic root of 42182681 is about 348.1059070138.

The spelling of 42182681 in words is "forty-two million, one hundred eighty-two thousand, six hundred eighty-one".