25631117 has 2 divisors, whose sum is σ = 25631118. Its totient is φ = 25631116.

The previous prime is 25631113. The next prime is 25631143. The reversal of 25631117 is 71113652.

It is an a-pointer prime, because the next prime (25631143) can be obtained adding 25631117 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25593481 + 37636 = 5059^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 25631117 - 2² = 25631113 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25631113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12815558 + 12815559.

It is an arithmetic number, because the mean of its divisors is an integer number (12815559).

Almost surely, 2^25631117 is an apocalyptic number.

It is an amenable number.

25631117 is a deficient number, since it is larger than the sum of its proper divisors (1).

25631117 is an equidigital number, since it uses as much as digits as its factorization.

25631117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 25631117 is about 5062.7183409706. The cubic root of 25631117 is about 294.8418840501.

Adding to 25631117 its reverse (71113652), we get a palindrome (96744769).

The spelling of 25631117 in words is "twenty-five million, six hundred thirty-one thousand, one hundred seventeen".