42131525 has 12 divisors (see below), whose sum is σ = 55316772. Its totient is φ = 31722240.

The previous prime is 42131521. The next prime is 42131527. The reversal of 42131525 is 52513124.

It can be written as a sum of positive squares in 6 ways, for example, as 128164 + 42003361 = 358^2 + 6481^2 .

It is not a de Polignac number, because 42131525 - 2² = 42131521 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 42131525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49142 + ... + 49991.

It is an arithmetic number, because the mean of its divisors is an integer number (4609731).

Almost surely, 2^42131525 is an apocalyptic number.

It is an amenable number.

42131525 is a deficient number, since it is larger than the sum of its proper divisors (13185247).

42131525 is a wasteful number, since it uses less digits than its factorization.

42131525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99160 (or 99155 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 42131525 is about 6490.8801406281. The cubic root of 42131525 is about 347.9651311564.

Adding to 42131525 its reverse (52513124), we get a palindrome (94644649).

The spelling of 42131525 in words is "forty-two million, one hundred thirty-one thousand, five hundred twenty-five".