25580197 has 2 divisors, whose sum is σ = 25580198. Its totient is φ = 25580196.

The previous prime is 25580147. The next prime is 25580207. The reversal of 25580197 is 79108552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 2405601 = 4814^2 + 1551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25580197 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 (25580147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790098 + 12790099.

It is an arithmetic number, because the mean of its divisors is an integer number (12790099).

Almost surely, 2^25580197 is an apocalyptic number.

It is an amenable number.

25580197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25580197 is an equidigital number, since it uses as much as digits as its factorization.

25580197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 25580197 is about 5057.6869219041. The cubic root of 25580197 is about 294.6465056252.

The spelling of 25580197 in words is "twenty-five million, five hundred eighty thousand, one hundred ninety-seven".