42542557 has 4 divisors (see below), whose sum is σ = 42694236. Its totient is φ = 42390880.

The previous prime is 42542531. The next prime is 42542569. The reversal of 42542557 is 75524524.

42542557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 35176761 + 7365796 = 5931^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 42542557 - 2²³ = 34153949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42542657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75418 + ... + 75979.

It is an arithmetic number, because the mean of its divisors is an integer number (10673559).

Almost surely, 2^42542557 is an apocalyptic number.

It is an amenable number.

42542557 is a deficient number, since it is larger than the sum of its proper divisors (151679).

42542557 is a wasteful number, since it uses less digits than its factorization.

42542557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151678.

The product of its digits is 56000, while the sum is 34.

The square root of 42542557 is about 6522.4655614269. The cubic root of 42542557 is about 349.0930450350.

The spelling of 42542557 in words is "forty-two million, five hundred forty-two thousand, five hundred fifty-seven".