25505243 has 4 divisors (see below), whose sum is σ = 25986528. Its totient is φ = 25023960.

The previous prime is 25505231. The next prime is 25505261. The reversal of 25505243 is 34250552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25505243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25505213) 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, 240563 + ... + 240668.

It is an arithmetic number, because the mean of its divisors is an integer number (6496632).

Almost surely, 2^25505243 is an apocalyptic number.

25505243 is a deficient number, since it is larger than the sum of its proper divisors (481285).

25505243 is an equidigital number, since it uses as much as digits as its factorization.

25505243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481284.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 25505243 is about 5050.2715768560. The cubic root of 25505243 is about 294.3584372138.

Adding to 25505243 its reverse (34250552), we get a palindrome (59755795).

The spelling of 25505243 in words is "twenty-five million, five hundred five thousand, two hundred forty-three".