25405231 has 2 divisors, whose sum is σ = 25405232. Its totient is φ = 25405230.

The previous prime is 25405229. The next prime is 25405253. The reversal of 25405231 is 13250452.

It is an a-pointer prime, because the next prime (25405253) can be obtained adding 25405231 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25405231 - 2¹ = 25405229 is a prime.

It is a super-3 number, since 3×25405231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 25405229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25405631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702615 + 12702616.

It is an arithmetic number, because the mean of its divisors is an integer number (12702616).

Almost surely, 2^25405231 is an apocalyptic number.

25405231 is a deficient number, since it is larger than the sum of its proper divisors (1).

25405231 is an equidigital number, since it uses as much as digits as its factorization.

25405231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 25405231 is about 5040.3602053822. The cubic root of 25405231 is about 293.9731838808.

Adding to 25405231 its reverse (13250452), we get a palindrome (38655683).

The spelling of 25405231 in words is "twenty-five million, four hundred five thousand, two hundred thirty-one".