42509141 has 4 divisors (see below), whose sum is σ = 43091532. Its totient is φ = 41926752.

The previous prime is 42509123. The next prime is 42509149. The reversal of 42509141 is 14190524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30846916 + 11662225 = 5554^2 + 3415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42509141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42509141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42509149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291086 + ... + 291231.

It is an arithmetic number, because the mean of its divisors is an integer number (10772883).

Almost surely, 2^42509141 is an apocalyptic number.

It is an amenable number.

42509141 is a deficient number, since it is larger than the sum of its proper divisors (582391).

42509141 is an equidigital number, since it uses as much as digits as its factorization.

42509141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582390.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 42509141 is about 6519.9034502054. The cubic root of 42509141 is about 349.0016201215.

Adding to 42509141 its reverse (14190524), we get a palindrome (56699665).

The spelling of 42509141 in words is "forty-two million, five hundred nine thousand, one hundred forty-one".