8425942409 has 2 divisors, whose sum is σ = 8425942410. Its totient is φ = 8425942408.

The previous prime is 8425942379. The next prime is 8425942417. The reversal of 8425942409 is 9042495248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7383621184 + 1042321225 = 85928^2 + 32285^2 .

It is a cyclic number.

It is not a de Polignac number, because 8425942409 - 2¹⁶ = 8425876873 is a prime.

It is not a weakly prime, because it can be changed into another prime (8425942439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4212971204 + 4212971205.

It is an arithmetic number, because the mean of its divisors is an integer number (4212971205).

Almost surely, 2^8425942409 is an apocalyptic number.

It is an amenable number.

8425942409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8425942409 is an equidigital number, since it uses as much as digits as its factorization.

8425942409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 8425942409 is about 91792.9322388167. The cubic root of 8425942409 is about 2034.8832431448.

The spelling of 8425942409 in words is "eight billion, four hundred twenty-five million, nine hundred forty-two thousand, four hundred nine".