25505013 has 4 divisors (see below), whose sum is σ = 34006688. Its totient is φ = 17003340.

The previous prime is 25505003. The next prime is 25505017. The reversal of 25505013 is 31050552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25505013 - 2¹⁴ = 25488629 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 (25505017) 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 in 3 ways as a sum of consecutive naturals, for example, 4250833 + ... + 4250838.

It is an arithmetic number, because the mean of its divisors is an integer number (8501672).

Almost surely, 2^25505013 is an apocalyptic number.

It is an amenable number.

25505013 is a deficient number, since it is larger than the sum of its proper divisors (8501675).

25505013 is an equidigital number, since it uses as much as digits as its factorization.

25505013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8501674.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 25505013 is about 5050.2488057520. The cubic root of 25505013 is about 294.3575523938.

Adding to 25505013 its reverse (31050552), we get a palindrome (56555565).

The spelling of 25505013 in words is "twenty-five million, five hundred five thousand, thirteen".