42544109 has 2 divisors, whose sum is σ = 42544110. Its totient is φ = 42544108.

The previous prime is 42544091. The next prime is 42544127. The reversal of 42544109 is 90144524.

Together with previous prime (42544091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (42544091) and next prime (42544127).

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 19166884 = 4835^2 + 4378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42544109 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 (42544199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272054 + 21272055.

It is an arithmetic number, because the mean of its divisors is an integer number (21272055).

Almost surely, 2^42544109 is an apocalyptic number.

It is an amenable number.

42544109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42544109 is an equidigital number, since it uses as much as digits as its factorization.

42544109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 42544109 is about 6522.5845337565. The cubic root of 42544109 is about 349.0972900848.

The spelling of 42544109 in words is "forty-two million, five hundred forty-four thousand, one hundred nine".