25217513 has 4 divisors (see below), whose sum is σ = 25227648. Its totient is φ = 25207380.

The previous prime is 25217483. The next prime is 25217537. The reversal of 25217513 is 31571252.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25217513 - 2²² = 21023209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25217113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (6306912).

Almost surely, 2^25217513 is an apocalyptic number.

It is an amenable number.

25217513 is a deficient number, since it is larger than the sum of its proper divisors (10135).

25217513 is an equidigital number, since it uses as much as digits as its factorization.

25217513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134.

The product of its digits is 2100, while the sum is 26.

The square root of 25217513 is about 5021.7041928015. The cubic root of 25217513 is about 293.2473420747.

Adding to 25217513 its reverse (31571252), we get a palindrome (56788765).

The spelling of 25217513 in words is "twenty-five million, two hundred seventeen thousand, five hundred thirteen".