25161613 has 2 divisors, whose sum is σ = 25161614. Its totient is φ = 25161612.

The previous prime is 25161611. The next prime is 25161623. The reversal of 25161613 is 31616152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19954089 + 5207524 = 4467^2 + 2282^2 .

It is a cyclic number.

It is not a de Polignac number, because 25161613 - 2¹ = 25161611 is a prime.

Together with 25161611, 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 (25161611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12580806 + 12580807.

It is an arithmetic number, because the mean of its divisors is an integer number (12580807).

Almost surely, 2^25161613 is an apocalyptic number.

It is an amenable number.

25161613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25161613 is an equidigital number, since it uses as much as digits as its factorization.

25161613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 25161613 is about 5016.1352653213. The cubic root of 25161613 is about 293.0304999953.

Adding to 25161613 its reverse (31616152), we get a palindrome (56777765).

It can be divided in two parts, 2 and 5161613, that added together give a palindrome (5161615).

The spelling of 25161613 in words is "twenty-five million, one hundred sixty-one thousand, six hundred thirteen".