25172543 has 16 divisors (see below), whose sum is σ = 28483584. Its totient is φ = 22044960.

The previous prime is 25172491. The next prime is 25172561. The reversal of 25172543 is 34527152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25172543 - 2²² = 20978239 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 (25172573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51446 + ... + 51932.

It is an arithmetic number, because the mean of its divisors is an integer number (1780224).

Almost surely, 2^25172543 is an apocalyptic number.

25172543 is a deficient number, since it is larger than the sum of its proper divisors (3311041).

25172543 is a wasteful number, since it uses less digits than its factorization.

25172543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662.

The product of its digits is 8400, while the sum is 29.

The square root of 25172543 is about 5017.2246312080. The cubic root of 25172543 is about 293.0729238748.

Adding to 25172543 its reverse (34527152), we get a palindrome (59699695).

The spelling of 25172543 in words is "twenty-five million, one hundred seventy-two thousand, five hundred forty-three".