25905197 has 2 divisors, whose sum is σ = 25905198. Its totient is φ = 25905196.

The previous prime is 25905169. The next prime is 25905203. The reversal of 25905197 is 79150952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17255716 + 8649481 = 4154^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 25905197 - 2⁶ = 25905133 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 25905197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25905097) 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, 12952598 + 12952599.

It is an arithmetic number, because the mean of its divisors is an integer number (12952599).

Almost surely, 2^25905197 is an apocalyptic number.

It is an amenable number.

25905197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25905197 is an equidigital number, since it uses as much as digits as its factorization.

25905197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 25905197 is about 5089.7148250172. The cubic root of 25905197 is about 295.8890997077.

The spelling of 25905197 in words is "twenty-five million, nine hundred five thousand, one hundred ninety-seven".