25231321 has 4 divisors (see below), whose sum is σ = 25294644. Its totient is φ = 25168000.

The previous prime is 25231319. The next prime is 25231331. The reversal of 25231321 is 12313252.

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 21483225 + 3748096 = 4635^2 + 1936^2 .

It is a cyclic number.

It is not a de Polignac number, because 25231321 - 2¹ = 25231319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25231301) 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, 31060 + ... + 31861.

It is an arithmetic number, because the mean of its divisors is an integer number (6323661).

Almost surely, 2^25231321 is an apocalyptic number.

It is an amenable number.

25231321 is a deficient number, since it is larger than the sum of its proper divisors (63323).

25231321 is an equidigital number, since it uses as much as digits as its factorization.

25231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63322.

The product of its digits is 360, while the sum is 19.

The square root of 25231321 is about 5023.0788367295. The cubic root of 25231321 is about 293.3008554205.

Adding to 25231321 its reverse (12313252), we get a palindrome (37544573).

It can be divided in two parts, 25231 and 321, that added together give a palindrome (25552).

The spelling of 25231321 in words is "twenty-five million, two hundred thirty-one thousand, three hundred twenty-one".