42529109 has 18 divisors (see below), whose sum is σ = 51476130. Its totient is φ = 34993056.

The previous prime is 42529099. The next prime is 42529111. The reversal of 42529109 is 90192524.

It can be written as a sum of positive squares in 3 ways, for example, as 25472209 + 17056900 = 5047^2 + 4130^2 .

It is not a de Polignac number, because 42529109 - 2¹² = 42525013 is a prime.

It is a super-2 number, since 2×42529109² = 3617450224667762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42529199) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 245747 + ... + 245919.

It is an arithmetic number, because the mean of its divisors is an integer number (2859785).

Almost surely, 2^42529109 is an apocalyptic number.

42529109 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

42529109 is a deficient number, since it is larger than the sum of its proper divisors (8947021).

42529109 is an equidigital number, since it uses as much as digits as its factorization.

42529109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 42529109 is about 6521.4345814399. The cubic root of 42529109 is about 349.0562575736.

The spelling of 42529109 in words is "forty-two million, five hundred twenty-nine thousand, one hundred nine".