25920217 has 2 divisors, whose sum is σ = 25920218. Its totient is φ = 25920216.

The previous prime is 25920211. The next prime is 25920221. The reversal of 25920217 is 71202952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25918281 + 1936 = 5091^2 + 44^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25920217 is a prime.

It is not a weakly prime, because it can be changed into another prime (25920211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960108 + 12960109.

It is an arithmetic number, because the mean of its divisors is an integer number (12960109).

Almost surely, 2^25920217 is an apocalyptic number.

It is an amenable number.

25920217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25920217 is an equidigital number, since it uses as much as digits as its factorization.

25920217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 25920217 is about 5091.1901359112. The cubic root of 25920217 is about 295.9462747939.

The spelling of 25920217 in words is "twenty-five million, nine hundred twenty thousand, two hundred seventeen".