25515223 has 2 divisors, whose sum is σ = 25515224. Its totient is φ = 25515222.

The previous prime is 25515221. The next prime is 25515227. The reversal of 25515223 is 32251552.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25515223 - 2¹ = 25515221 is a prime.

Together with 25515221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25515221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12757611 + 12757612.

It is an arithmetic number, because the mean of its divisors is an integer number (12757612).

Almost surely, 2^25515223 is an apocalyptic number.

25515223 is a deficient number, since it is larger than the sum of its proper divisors (1).

25515223 is an equidigital number, since it uses as much as digits as its factorization.

25515223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 25.

The square root of 25515223 is about 5051.2595458955. The cubic root of 25515223 is about 294.3968255838.

Adding to 25515223 its reverse (32251552), we get a palindrome (57766775).

The spelling of 25515223 in words is "twenty-five million, five hundred fifteen thousand, two hundred twenty-three".