42172525 has 12 divisors (see below), whose sum is σ = 54098100. Its totient is φ = 32574080.

The previous prime is 42172523. The next prime is 42172531. The reversal of 42172525 is 52527124.

It can be written as a sum of positive squares in 6 ways, for example, as 2268036 + 39904489 = 1506^2 + 6317^2 .

It is not a de Polignac number, because 42172525 - 2¹ = 42172523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42172493 and 42172502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172523) 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, 28360 + ... + 29809.

It is an arithmetic number, because the mean of its divisors is an integer number (4508175).

Almost surely, 2^42172525 is an apocalyptic number.

It is an amenable number.

42172525 is a deficient number, since it is larger than the sum of its proper divisors (11925575).

42172525 is a wasteful number, since it uses less digits than its factorization.

42172525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58208 (or 58203 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 42172525 is about 6494.0376500294. The cubic root of 42172525 is about 348.0779678432.

Adding to 42172525 its reverse (52527124), we get a palindrome (94699649).

The spelling of 42172525 in words is "forty-two million, one hundred seventy-two thousand, five hundred twenty-five".