42609709 has 2 divisors, whose sum is σ = 42609710. Its totient is φ = 42609708.

The previous prime is 42609691. The next prime is 42609737. The reversal of 42609709 is 90790624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34257609 + 8352100 = 5853^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 42609709 - 2⁹ = 42609197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42609109) 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, 21304854 + 21304855.

It is an arithmetic number, because the mean of its divisors is an integer number (21304855).

Almost surely, 2^42609709 is an apocalyptic number.

It is an amenable number.

42609709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42609709 is an equidigital number, since it uses as much as digits as its factorization.

42609709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 42609709 is about 6527.6112782549. The cubic root of 42609709 is about 349.2766256997.

The spelling of 42609709 in words is "forty-two million, six hundred nine thousand, seven hundred nine".