25640171 has 2 divisors, whose sum is σ = 25640172. Its totient is φ = 25640170.

The previous prime is 25640081. The next prime is 25640183. The reversal of 25640171 is 17104652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25640171 - 2¹⁰ = 25639147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25640171.

It is not a weakly prime, because it can be changed into another prime (25640071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820085 + 12820086.

It is an arithmetic number, because the mean of its divisors is an integer number (12820086).

Almost surely, 2^25640171 is an apocalyptic number.

25640171 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640171 is an equidigital number, since it uses as much as digits as its factorization.

25640171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 25640171 is about 5063.6124456755. The cubic root of 25640171 is about 294.8765968584.

The spelling of 25640171 in words is "twenty-five million, six hundred forty thousand, one hundred seventy-one".