25216513 has 4 divisors (see below), whose sum is σ = 28818880. Its totient is φ = 21614148.

The previous prime is 25216507. The next prime is 25216567. The reversal of 25216513 is 31561252.

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 a cyclic number.

It is not a de Polignac number, because 25216513 - 2⁵ = 25216481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25216613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801173 + ... + 1801186.

It is an arithmetic number, because the mean of its divisors is an integer number (7204720).

Almost surely, 2^25216513 is an apocalyptic number.

It is an amenable number.

25216513 is a deficient number, since it is larger than the sum of its proper divisors (3602367).

25216513 is an equidigital number, since it uses as much as digits as its factorization.

25216513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602366.

The product of its digits is 1800, while the sum is 25.

The square root of 25216513 is about 5021.6046240221. The cubic root of 25216513 is about 293.2434657842.

Adding to 25216513 its reverse (31561252), we get a palindrome (56777765).

The spelling of 25216513 in words is "twenty-five million, two hundred sixteen thousand, five hundred thirteen".