4194168521 has 16 divisors (see below), whose sum is σ = 4354074000. Its totient is φ = 4038144000.

The previous prime is 4194168497. The next prime is 4194168541. The reversal of 4194168521 is 1258614914.

It can be written as a sum of positive squares in 8 ways, for example, as 834343225 + 3359825296 = 28885^2 + 57964^2 .

It is a cyclic number.

It is not a de Polignac number, because 4194168521 - 2⁶ = 4194168457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4194168541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544505 + ... + 552153.

It is an arithmetic number, because the mean of its divisors is an integer number (272129625).

Almost surely, 2^4194168521 is an apocalyptic number.

It is an amenable number.

4194168521 is a deficient number, since it is larger than the sum of its proper divisors (159905479).

4194168521 is a wasteful number, since it uses less digits than its factorization.

4194168521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900.

The product of its digits is 69120, while the sum is 41.

The square root of 4194168521 is about 64762.4005191284. The cubic root of 4194168521 is about 1612.6815799045.

The spelling of 4194168521 in words is "four billion, one hundred ninety-four million, one hundred sixty-eight thousand, five hundred twenty-one".