25705817 has 2 divisors, whose sum is σ = 25705818. Its totient is φ = 25705816.

The previous prime is 25705807. The next prime is 25705829. The reversal of 25705817 is 71850752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22080601 + 3625216 = 4699^2 + 1904^2 .

It is a cyclic number.

It is not a de Polignac number, because 25705817 - 2¹⁶ = 25640281 is a prime.

It is not a weakly prime, because it can be changed into another prime (25705807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852908 + 12852909.

It is an arithmetic number, because the mean of its divisors is an integer number (12852909).

Almost surely, 2^25705817 is an apocalyptic number.

It is an amenable number.

25705817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25705817 is an equidigital number, since it uses as much as digits as its factorization.

25705817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 25705817 is about 5070.0904331185. The cubic root of 25705817 is about 295.1280378798.

The spelling of 25705817 in words is "twenty-five million, seven hundred five thousand, eight hundred seventeen".