42587681 has 2 divisors, whose sum is σ = 42587682. Its totient is φ = 42587680.

The previous prime is 42587659. The next prime is 42587711. The reversal of 42587681 is 18678524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24601600 + 17986081 = 4960^2 + 4241^2 .

It is a cyclic number.

It is not a de Polignac number, because 42587681 - 2⁶ = 42587617 is a prime.

It is a super-2 number, since 2×42587681² = 3627421145915522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42587081) 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 as a sum of consecutive naturals, namely, 21293840 + 21293841.

It is an arithmetic number, because the mean of its divisors is an integer number (21293841).

Almost surely, 2^42587681 is an apocalyptic number.

It is an amenable number.

42587681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42587681 is an equidigital number, since it uses as much as digits as its factorization.

42587681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 42587681 is about 6525.9237660273. The cubic root of 42587681 is about 349.2164266518.

The spelling of 42587681 in words is "forty-two million, five hundred eighty-seven thousand, six hundred eighty-one".