42125813 has 8 divisors (see below), whose sum is σ = 44750232. Its totient is φ = 39517696.

The previous prime is 42125789. The next prime is 42125821. The reversal of 42125813 is 31852124.

42125813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 432964 + 41692849 = 658^2 + 6457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42125813 - 2²⁴ = 25348597 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 (42125833) 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 7 ways as a sum of consecutive naturals, for example, 1481 + ... + 9297.

It is an arithmetic number, because the mean of its divisors is an integer number (5593779).

Almost surely, 2^42125813 is an apocalyptic number.

It is an amenable number.

42125813 is a deficient number, since it is larger than the sum of its proper divisors (2624419).

42125813 is a wasteful number, since it uses less digits than its factorization.

42125813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8151.

The product of its digits is 1920, while the sum is 26.

The square root of 42125813 is about 6490.4401237512. The cubic root of 42125813 is about 347.9494052706.

Adding to 42125813 its reverse (31852124), we get a palindrome (73977937).

The spelling of 42125813 in words is "forty-two million, one hundred twenty-five thousand, eight hundred thirteen".