42641639 has 2 divisors, whose sum is σ = 42641640. Its totient is φ = 42641638.

The previous prime is 42641603. The next prime is 42641659. The reversal of 42641639 is 93614624.

42641639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42641639 - 2⁸ = 42641383 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42641599 and 42641608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42641659) 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, 21320819 + 21320820.

It is an arithmetic number, because the mean of its divisors is an integer number (21320820).

Almost surely, 2^42641639 is an apocalyptic number.

42641639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42641639 is an equidigital number, since it uses as much as digits as its factorization.

42641639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 42641639 is about 6530.0565847472. The cubic root of 42641639 is about 349.3638485287.

The spelling of 42641639 in words is "forty-two million, six hundred forty-one thousand, six hundred thirty-nine".