3825974221 has 2 divisors, whose sum is σ = 3825974222. Its totient is φ = 3825974220.

The previous prime is 3825974209. The next prime is 3825974237. The reversal of 3825974221 is 1224795283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3009729321 + 816244900 = 54861^2 + 28570^2 .

It is an emirp because it is prime and its reverse (1224795283) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3825974221 - 2¹⁵ = 3825941453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3825974281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1912987110 + 1912987111.

It is an arithmetic number, because the mean of its divisors is an integer number (1912987111).

Almost surely, 2^3825974221 is an apocalyptic number.

It is an amenable number.

3825974221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3825974221 is an equidigital number, since it uses as much as digits as its factorization.

3825974221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 3825974221 is about 61854.4599927928. The cubic root of 3825974221 is about 1564.0381656001.

The spelling of 3825974221 in words is "three billion, eight hundred twenty-five million, nine hundred seventy-four thousand, two hundred twenty-one".