42452681 has 2 divisors, whose sum is σ = 42452682. Its totient is φ = 42452680.

The previous prime is 42452677. The next prime is 42452693. The reversal of 42452681 is 18625424.

42452681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25847056 + 16605625 = 5084^2 + 4075^2 .

It is a cyclic number.

It is not a de Polignac number, because 42452681 - 2² = 42452677 is a prime.

It is a super-2 number, since 2×42452681² = 3604460248175522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_2573474 and since 42452681 and 2573474 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42452381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21226340 + 21226341.

It is an arithmetic number, because the mean of its divisors is an integer number (21226341).

Almost surely, 2^42452681 is an apocalyptic number.

It is an amenable number.

42452681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42452681 is an equidigital number, since it uses as much as digits as its factorization.

42452681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 32.

The square root of 42452681 is about 6515.5721928316. The cubic root of 42452681 is about 348.8470387675.

The spelling of 42452681 in words is "forty-two million, four hundred fifty-two thousand, six hundred eighty-one".