42045109 has 2 divisors, whose sum is σ = 42045110. Its totient is φ = 42045108.

The previous prime is 42045103. The next prime is 42045121. The reversal of 42045109 is 90154024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 11242609 = 5550^2 + 3353^2 .

It is a cyclic number.

It is not a de Polignac number, because 42045109 - 2¹⁹ = 41520821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42045103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21022554 + 21022555.

It is an arithmetic number, because the mean of its divisors is an integer number (21022555).

Almost surely, 2^42045109 is an apocalyptic number.

It is an amenable number.

42045109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42045109 is an equidigital number, since it uses as much as digits as its factorization.

42045109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42045109 is about 6484.2199993523. The cubic root of 42045109 is about 347.7270644757.

The spelling of 42045109 in words is "forty-two million, forty-five thousand, one hundred nine".