25544321 has 4 divisors (see below), whose sum is σ = 27866544. Its totient is φ = 23222100.

The previous prime is 25544291. The next prime is 25544327. The reversal of 25544321 is 12344552.

It is a happy number.

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 25544321 - 2⁶ = 25544257 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 (25544327) 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, 1161095 + ... + 1161116.

It is an arithmetic number, because the mean of its divisors is an integer number (6966636).

Almost surely, 2^25544321 is an apocalyptic number.

It is an amenable number.

25544321 is a deficient number, since it is larger than the sum of its proper divisors (2322223).

25544321 is a wasteful number, since it uses less digits than its factorization.

25544321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322222.

The product of its digits is 4800, while the sum is 26.

The square root of 25544321 is about 5054.1389969015. The cubic root of 25544321 is about 294.5086948064.

Adding to 25544321 its reverse (12344552), we get a palindrome (37888873).

The spelling of 25544321 in words is "twenty-five million, five hundred forty-four thousand, three hundred twenty-one".