25280321 has 4 divisors (see below), whose sum is σ = 27578544. Its totient is φ = 22982100.

The previous prime is 25280273. The next prime is 25280327. The reversal of 25280321 is 12308252.

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 25280321 - 2¹⁴ = 25263937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25280327) 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, 1149095 + ... + 1149116.

It is an arithmetic number, because the mean of its divisors is an integer number (6894636).

Almost surely, 2^25280321 is an apocalyptic number.

It is an amenable number.

25280321 is a deficient number, since it is larger than the sum of its proper divisors (2298223).

25280321 is a wasteful number, since it uses less digits than its factorization.

25280321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298222.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 25280321 is about 5027.9539576253. The cubic root of 25280321 is about 293.4905990660.

Adding to 25280321 its reverse (12308252), we get a palindrome (37588573).

The spelling of 25280321 in words is "twenty-five million, two hundred eighty thousand, three hundred twenty-one".