42531121 has 4 divisors (see below), whose sum is σ = 42713892. Its totient is φ = 42348352.

The previous prime is 42531119. The next prime is 42531133. The reversal of 42531121 is 12113524.

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 17139600 + 25391521 = 4140^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 42531121 - 2¹ = 42531119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42531191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91036 + ... + 91501.

It is an arithmetic number, because the mean of its divisors is an integer number (10678473).

Almost surely, 2^42531121 is an apocalyptic number.

It is an amenable number.

42531121 is a deficient number, since it is larger than the sum of its proper divisors (182771).

42531121 is a wasteful number, since it uses less digits than its factorization.

42531121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182770.

The product of its digits is 240, while the sum is 19.

The square root of 42531121 is about 6521.5888401524. The cubic root of 42531121 is about 349.0617619613.

Adding to 42531121 its reverse (12113524), we get a palindrome (54644645).

The spelling of 42531121 in words is "forty-two million, five hundred thirty-one thousand, one hundred twenty-one".