42279109 has 2 divisors, whose sum is σ = 42279110. Its totient is φ = 42279108.

The previous prime is 42279079. The next prime is 42279157. The reversal of 42279109 is 90197224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 1600225 = 6378^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 42279109 - 2¹¹ = 42277061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42279169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21139554 + 21139555.

It is an arithmetic number, because the mean of its divisors is an integer number (21139555).

Almost surely, 2^42279109 is an apocalyptic number.

It is an amenable number.

42279109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42279109 is an equidigital number, since it uses as much as digits as its factorization.

42279109 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 34.

The square root of 42279109 is about 6502.2387683013. The cubic root of 42279109 is about 348.3709574270.

The spelling of 42279109 in words is "forty-two million, two hundred seventy-nine thousand, one hundred nine".