25722247 has 2 divisors, whose sum is σ = 25722248. Its totient is φ = 25722246.

The previous prime is 25722239. The next prime is 25722251. The reversal of 25722247 is 74222752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25722247 - 2³ = 25722239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25722227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12861123 + 12861124.

It is an arithmetic number, because the mean of its divisors is an integer number (12861124).

Almost surely, 2^25722247 is an apocalyptic number.

25722247 is a deficient number, since it is larger than the sum of its proper divisors (1).

25722247 is an equidigital number, since it uses as much as digits as its factorization.

25722247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 31.

The square root of 25722247 is about 5071.7104609786. The cubic root of 25722247 is about 295.1909020032.

Adding to 25722247 its reverse (74222752), we get a palindrome (99944999).

The spelling of 25722247 in words is "twenty-five million, seven hundred twenty-two thousand, two hundred forty-seven".