25128161 has 2 divisors, whose sum is σ = 25128162. Its totient is φ = 25128160.

The previous prime is 25128139. The next prime is 25128223. The reversal of 25128161 is 16182152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12737761 + 12390400 = 3569^2 + 3520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25128161 is a prime.

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 25128161.

It is not a weakly prime, because it can be changed into another prime (25128101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564080 + 12564081.

It is an arithmetic number, because the mean of its divisors is an integer number (12564081).

Almost surely, 2^25128161 is an apocalyptic number.

It is an amenable number.

25128161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128161 is an equidigital number, since it uses as much as digits as its factorization.

25128161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 25128161 is about 5012.7997167252. The cubic root of 25128161 is about 292.9005824688.

The spelling of 25128161 in words is "twenty-five million, one hundred twenty-eight thousand, one hundred sixty-one".