42641779 has 2 divisors, whose sum is σ = 42641780. Its totient is φ = 42641778.

The previous prime is 42641777. The next prime is 42641783. The reversal of 42641779 is 97714624.

42641779 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 is a cyclic number.

It is not a de Polignac number, because 42641779 - 2¹ = 42641777 is a prime.

Together with 42641777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42641773) 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, 21320889 + 21320890.

It is an arithmetic number, because the mean of its divisors is an integer number (21320890).

Almost surely, 2^42641779 is an apocalyptic number.

42641779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42641779 is an equidigital number, since it uses as much as digits as its factorization.

42641779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 42641779 is about 6530.0673044005. The cubic root of 42641779 is about 349.3642308693.

The spelling of 42641779 in words is "forty-two million, six hundred forty-one thousand, seven hundred seventy-nine".