25505047 has 4 divisors (see below), whose sum is σ = 25626136. Its totient is φ = 25383960.

The previous prime is 25505041. The next prime is 25505057. The reversal of 25505047 is 74050552.

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-25505047 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 (25505041) 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, 60228 + ... + 60649.

It is an arithmetic number, because the mean of its divisors is an integer number (6406534).

Almost surely, 2^25505047 is an apocalyptic number.

25505047 is a deficient number, since it is larger than the sum of its proper divisors (121089).

25505047 is a wasteful number, since it uses less digits than its factorization.

25505047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121088.

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 25505047 is about 5050.2521719217. The cubic root of 25505047 is about 294.3576831936.

Adding to 25505047 its reverse (74050552), we get a palindrome (99555599).

The spelling of 25505047 in words is "twenty-five million, five hundred five thousand, forty-seven".