4394366521 has 2 divisors, whose sum is σ = 4394366522. Its totient is φ = 4394366520.

The previous prime is 4394366461. The next prime is 4394366539. The reversal of 4394366521 is 1256634934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3368061225 + 1026305296 = 58035^2 + 32036^2 .

It is a cyclic number.

It is not a de Polignac number, because 4394366521 - 2²¹ = 4392269369 is a prime.

It is not a weakly prime, because it can be changed into another prime (4394366621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2197183260 + 2197183261.

It is an arithmetic number, because the mean of its divisors is an integer number (2197183261).

Almost surely, 2^4394366521 is an apocalyptic number.

It is an amenable number.

4394366521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4394366521 is an equidigital number, since it uses as much as digits as its factorization.

4394366521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 43.

The square root of 4394366521 is about 66290.0182606703. The cubic root of 4394366521 is about 1637.9429047730.

The spelling of 4394366521 in words is "four billion, three hundred ninety-four million, three hundred sixty-six thousand, five hundred twenty-one".