25224247 has 4 divisors (see below), whose sum is σ = 25264120. Its totient is φ = 25184376.

The previous prime is 25224239. The next prime is 25224259. The reversal of 25224247 is 74242252.

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 25224247 - 2³ = 25224239 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 (25224217) 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 3 ways as a sum of consecutive naturals, for example, 18972 + ... + 20257.

It is an arithmetic number, because the mean of its divisors is an integer number (6316030).

Almost surely, 2^25224247 is an apocalyptic number.

25224247 is a deficient number, since it is larger than the sum of its proper divisors (39873).

25224247 is an equidigital number, since it uses as much as digits as its factorization.

25224247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39872.

The product of its digits is 8960, while the sum is 28.

The square root of 25224247 is about 5022.3746375594. The cubic root of 25224247 is about 293.2734423468.

Adding to 25224247 its reverse (74242252), we get a palindrome (99466499).

The spelling of 25224247 in words is "twenty-five million, two hundred twenty-four thousand, two hundred forty-seven".