25172447 has 4 divisors (see below), whose sum is σ = 25187736. Its totient is φ = 25157160.

The previous prime is 25172437. The next prime is 25172449. The reversal of 25172447 is 74427152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25172447 - 2⁴ = 25172431 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 (25172449) 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, 4829 + ... + 8582.

It is an arithmetic number, because the mean of its divisors is an integer number (6296934).

Almost surely, 2^25172447 is an apocalyptic number.

25172447 is a deficient number, since it is larger than the sum of its proper divisors (15289).

25172447 is a wasteful number, since it uses less digits than its factorization.

25172447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15288.

The product of its digits is 15680, while the sum is 32.

The square root of 25172447 is about 5017.2150641566. The cubic root of 25172447 is about 293.0725513123.

Adding to 25172447 its reverse (74427152), we get a palindrome (99599599).

The spelling of 25172447 in words is "twenty-five million, one hundred seventy-two thousand, four hundred forty-seven".