2168512893 has 6 divisors (see below), whose sum is σ = 3132296414. Its totient is φ = 1445675256.

The previous prime is 2168512867. The next prime is 2168512897. The reversal of 2168512893 is 3982158612.

It can be written as a sum of positive squares in only one way, i.e., 1918177209 + 250335684 = 43797^2 + 15822^2 .

It is not a de Polignac number, because 2168512893 - 2¹⁰ = 2168511869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168512897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120472930 + ... + 120472947.

Almost surely, 2^2168512893 is an apocalyptic number.

It is an amenable number.

2168512893 is a deficient number, since it is larger than the sum of its proper divisors (963783521).

2168512893 is a wasteful number, since it uses less digits than its factorization.

2168512893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240945883 (or 240945880 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 2168512893 is about 46567.2942417745. The cubic root of 2168512893 is about 1294.3567797968.

The spelling of 2168512893 in words is "two billion, one hundred sixty-eight million, five hundred twelve thousand, eight hundred ninety-three".