25505231 has 2 divisors, whose sum is σ = 25505232. Its totient is φ = 25505230.

The previous prime is 25505213. The next prime is 25505261. The reversal of 25505231 is 13250552.

Together with previous prime (25505213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25505231 - 2⁶ = 25505167 is a prime.

It is a super-2 number, since 2×25505231² = 1301033616726722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25505197 and 25505206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752615 + 12752616.

It is an arithmetic number, because the mean of its divisors is an integer number (12752616).

Almost surely, 2^25505231 is an apocalyptic number.

25505231 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505231 is an equidigital number, since it uses as much as digits as its factorization.

25505231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 25505231 is about 5050.2703888010. The cubic root of 25505231 is about 294.3583910494.

Adding to 25505231 its reverse (13250552), we get a palindrome (38755783).

The spelling of 25505231 in words is "twenty-five million, five hundred five thousand, two hundred thirty-one".