42505129 has 4 divisors (see below), whose sum is σ = 42520576. Its totient is φ = 42489684.

The previous prime is 42505121. The next prime is 42505157. The reversal of 42505129 is 92150524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42505129 - 2³ = 42505121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42505097 and 42505106.

It is not an unprimeable number, because it can be changed into a prime (42505121) 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, 2349 + ... + 9514.

It is an arithmetic number, because the mean of its divisors is an integer number (10630144).

Almost surely, 2^42505129 is an apocalyptic number.

It is an amenable number.

42505129 is a deficient number, since it is larger than the sum of its proper divisors (15447).

42505129 is a wasteful number, since it uses less digits than its factorization.

42505129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15446.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 42505129 is about 6519.5957696777. The cubic root of 42505129 is about 348.9906402199.

The spelling of 42505129 in words is "forty-two million, five hundred five thousand, one hundred twenty-nine".