25563217 has 2 divisors, whose sum is σ = 25563218. Its totient is φ = 25563216.

The previous prime is 25563193. The next prime is 25563233. The reversal of 25563217 is 71236552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 81 = 5056^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 25563217 - 2¹⁹ = 25038929 is a prime.

It is not a weakly prime, because it can be changed into another prime (25563277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12781608 + 12781609.

It is an arithmetic number, because the mean of its divisors is an integer number (12781609).

Almost surely, 2^25563217 is an apocalyptic number.

It is an amenable number.

25563217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25563217 is an equidigital number, since it uses as much as digits as its factorization.

25563217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 31.

The square root of 25563217 is about 5056.0080102785. The cubic root of 25563217 is about 294.5812962618.

Adding to 25563217 its reverse (71236552), we get a palindrome (96799769).

The spelling of 25563217 in words is "twenty-five million, five hundred sixty-three thousand, two hundred seventeen".