2194021575729 has 27 divisors (see below), whose sum is σ = 3313076221273. Its totient is φ = 1399021048392.

The previous prime is 2194021575721. The next prime is 2194021575743. The reversal of 2194021575729 is 9275751204912.

The square root of 2194021575729 is 1481223.

It is a perfect power (a square), and thus also a powerful number.

2194021575729 is a `hidden beast` number, since 2 + 1 + 9 + 40 + 2 + 1 + 575 + 7 + 29 = 666.

It is not a de Polignac number, because 2194021575729 - 2³ = 2194021575721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2194021575721) 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 26 ways as a sum of consecutive naturals, for example, 102193654 + ... + 102215120.

Almost surely, 2^{2194021575729} is an apocalyptic number.

2194021575729 is the 1481223-rd square number.

2194021575729 is the 740612-nd centered octagonal number.

It is an amenable number.

2194021575729 is a deficient number, since it is larger than the sum of its proper divisors (1119054645544).

2194021575729 is an frugal number, since it uses more digits than its factorization.

2194021575729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42986 (or 21493 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 2194021575729 in words is "two trillion, one hundred ninety-four billion, twenty-one million, five hundred seventy-five thousand, seven hundred twenty-nine".