25049221 has 2 divisors, whose sum is σ = 25049222. Its totient is φ = 25049220.

The previous prime is 25049207. The next prime is 25049281. The reversal of 25049221 is 12294052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 3062500 = 4689^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 25049221 - 2¹⁹ = 24524933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25049281) 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, 12524610 + 12524611.

It is an arithmetic number, because the mean of its divisors is an integer number (12524611).

Almost surely, 2^25049221 is an apocalyptic number.

It is an amenable number.

25049221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25049221 is an equidigital number, since it uses as much as digits as its factorization.

25049221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25049221 is about 5004.9196796752. The cubic root of 25049221 is about 292.5935454565.

The spelling of 25049221 in words is "twenty-five million, forty-nine thousand, two hundred twenty-one".