25564219 has 2 divisors, whose sum is σ = 25564220. Its totient is φ = 25564218.

The previous prime is 25564213. The next prime is 25564223. The reversal of 25564219 is 91246552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25564219 - 2¹¹ = 25562171 is a prime.

It is a super-2 number, since 2×25564219² = 1307058586159922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25564213) 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, 12782109 + 12782110.

It is an arithmetic number, because the mean of its divisors is an integer number (12782110).

Almost surely, 2^25564219 is an apocalyptic number.

25564219 is a deficient number, since it is larger than the sum of its proper divisors (1).

25564219 is an equidigital number, since it uses as much as digits as its factorization.

25564219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 25564219 is about 5056.1070993404. The cubic root of 25564219 is about 294.5851451071.

The spelling of 25564219 in words is "twenty-five million, five hundred sixty-four thousand, two hundred nineteen".