25516243 has 4 divisors (see below), whose sum is σ = 26109688. Its totient is φ = 24922800.

The previous prime is 25516237. The next prime is 25516247. The reversal of 25516243 is 34261552.

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

It is not a de Polignac number, because 25516243 - 2²¹ = 23419091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25516247) 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, 296658 + ... + 296743.

It is an arithmetic number, because the mean of its divisors is an integer number (6527422).

Almost surely, 2^25516243 is an apocalyptic number.

25516243 is a deficient number, since it is larger than the sum of its proper divisors (593445).

25516243 is an equidigital number, since it uses as much as digits as its factorization.

25516243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593444.

The product of its digits is 7200, while the sum is 28.

The square root of 25516243 is about 5051.3605098033. The cubic root of 25516243 is about 294.4007484806.

Adding to 25516243 its reverse (34261552), we get a palindrome (59777795).

The spelling of 25516243 in words is "twenty-five million, five hundred sixteen thousand, two hundred forty-three".