42013109 has 2 divisors, whose sum is σ = 42013110. Its totient is φ = 42013108.

The previous prime is 42013099. The next prime is 42013121. The reversal of 42013109 is 90131024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 8720209 = 5770^2 + 2953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42013109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42016109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21006554 + 21006555.

It is an arithmetic number, because the mean of its divisors is an integer number (21006555).

Almost surely, 2^42013109 is an apocalyptic number.

It is an amenable number.

42013109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42013109 is an equidigital number, since it uses as much as digits as its factorization.

42013109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 42013109 is about 6481.7520008097. The cubic root of 42013109 is about 347.6388251976.

The spelling of 42013109 in words is "forty-two million, thirteen thousand, one hundred nine".