42136709 has 2 divisors, whose sum is σ = 42136710. Its totient is φ = 42136708.

The previous prime is 42136697. The next prime is 42136723. The reversal of 42136709 is 90763124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 172225 = 6478^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 42136709 - 2¹⁶ = 42071173 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 (42136789) 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, 21068354 + 21068355.

It is an arithmetic number, because the mean of its divisors is an integer number (21068355).

Almost surely, 2^42136709 is an apocalyptic number.

It is an amenable number.

42136709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42136709 is an equidigital number, since it uses as much as digits as its factorization.

42136709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 42136709 is about 6491.2794578573. The cubic root of 42136709 is about 347.9794021587.

The spelling of 42136709 in words is "forty-two million, one hundred thirty-six thousand, seven hundred nine".