25513321 has 4 divisors (see below), whose sum is σ = 25528644. Its totient is φ = 25498000.

The previous prime is 25513309. The next prime is 25513331. The reversal of 25513321 is 12331552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13402921 + 12110400 = 3661^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 25513321 - 2⁵ = 25513289 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25513292 and 25513301.

It is not an unprimeable number, because it can be changed into a prime (25513331) 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, 4810 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (6382161).

Almost surely, 2^25513321 is an apocalyptic number.

It is an amenable number.

25513321 is a deficient number, since it is larger than the sum of its proper divisors (15323).

25513321 is a wasteful number, since it uses less digits than its factorization.

25513321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15322.

The product of its digits is 900, while the sum is 22.

The square root of 25513321 is about 5051.0712725124. The cubic root of 25513321 is about 294.3895102558.

Adding to 25513321 its reverse (12331552), we get a palindrome (37844873).

The spelling of 25513321 in words is "twenty-five million, five hundred thirteen thousand, three hundred twenty-one".