25135631 has 2 divisors, whose sum is σ = 25135632. Its totient is φ = 25135630.

The previous prime is 25135609. The next prime is 25135657. The reversal of 25135631 is 13653152.

It is an a-pointer prime, because the next prime (25135657) can be obtained adding 25135631 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25135631 - 2¹⁴ = 25119247 is a prime.

It is a super-3 number, since 3×25135631³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25135631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25135661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12567815 + 12567816.

It is an arithmetic number, because the mean of its divisors is an integer number (12567816).

Almost surely, 2^25135631 is an apocalyptic number.

25135631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25135631 is an equidigital number, since it uses as much as digits as its factorization.

25135631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 25135631 is about 5013.5447539640. The cubic root of 25135631 is about 292.9296037008.

Adding to 25135631 its reverse (13653152), we get a palindrome (38788783).

The spelling of 25135631 in words is "twenty-five million, one hundred thirty-five thousand, six hundred thirty-one".