25172047 has 4 divisors (see below), whose sum is σ = 25182576. Its totient is φ = 25161520.

The previous prime is 25172041. The next prime is 25172083. The reversal of 25172047 is 74027152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25172047 - 2³ = 25172039 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 (25172041) 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, 243 + ... + 7099.

It is an arithmetic number, because the mean of its divisors is an integer number (6295644).

Almost surely, 2^25172047 is an apocalyptic number.

25172047 is a deficient number, since it is larger than the sum of its proper divisors (10529).

25172047 is an equidigital number, since it uses as much as digits as its factorization.

25172047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10528.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 25172047 is about 5017.1752012462. The cubic root of 25172047 is about 293.0709989584.

Adding to 25172047 its reverse (74027152), we get a palindrome (99199199).

The spelling of 25172047 in words is "twenty-five million, one hundred seventy-two thousand, forty-seven".