42680861 has 2 divisors, whose sum is σ = 42680862. Its totient is φ = 42680860.

The previous prime is 42680857. The next prime is 42680867. The reversal of 42680861 is 16808624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 21104836 = 4645^2 + 4594^2 .

It is a cyclic number.

It is not a de Polignac number, because 42680861 - 2² = 42680857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42680867) 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, 21340430 + 21340431.

It is an arithmetic number, because the mean of its divisors is an integer number (21340431).

Almost surely, 2^42680861 is an apocalyptic number.

It is an amenable number.

42680861 is a deficient number, since it is larger than the sum of its proper divisors (1).

42680861 is an equidigital number, since it uses as much as digits as its factorization.

42680861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 42680861 is about 6533.0590843800. The cubic root of 42680861 is about 349.4709312617.

The spelling of 42680861 in words is "forty-two million, six hundred eighty thousand, eight hundred sixty-one".