8394242581 has 2 divisors, whose sum is σ = 8394242582. Its totient is φ = 8394242580.

The previous prime is 8394242573. The next prime is 8394242657. The reversal of 8394242581 is 1852424938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7260573681 + 1133668900 = 85209^2 + 33670^2 .

It is a cyclic number.

It is not a de Polignac number, because 8394242581 - 2³ = 8394242573 is a prime.

It is a super-2 number, since 2×8394242581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8394242561) 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, 4197121290 + 4197121291.

It is an arithmetic number, because the mean of its divisors is an integer number (4197121291).

Almost surely, 2^8394242581 is an apocalyptic number.

It is an amenable number.

8394242581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8394242581 is an equidigital number, since it uses as much as digits as its factorization.

8394242581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 46.

The square root of 8394242581 is about 91620.0992195490. The cubic root of 8394242581 is about 2032.3281773468.

The spelling of 8394242581 in words is "eight billion, three hundred ninety-four million, two hundred forty-two thousand, five hundred eighty-one".