42281109 has 20 divisors (see below), whose sum is σ = 68020876. Its totient is φ = 26018496.

The previous prime is 42281093. The next prime is 42281119. The reversal of 42281109 is 90118224.

It can be written as a sum of positive squares in 2 ways, for example, as 14085009 + 28196100 = 3753^2 + 5310^2 .

It is not a de Polignac number, because 42281109 - 2⁴ = 42281093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42281119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19024 + ... + 21129.

Almost surely, 2^42281109 is an apocalyptic number.

It is an amenable number.

42281109 is a deficient number, since it is larger than the sum of its proper divisors (25739767).

42281109 is a wasteful number, since it uses less digits than its factorization.

42281109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40178 (or 40169 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42281109 is about 6502.3925596660. The cubic root of 42281109 is about 348.3764505334.

The spelling of 42281109 in words is "forty-two million, two hundred eighty-one thousand, one hundred nine".