2792779087921 has 3 divisors (see below), whose sum is σ = 2792780759083. Its totient is φ = 2792777416760.

The previous prime is 2792779087909. The next prime is 2792779087937. The reversal of 2792779087921 is 1297809772972.

The square root of 2792779087921 is 1671161.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2578076598321 + 214702489600 = 1605639^2 + 463360^2 .

It is not a de Polignac number, because 2792779087921 - 2²⁵ = 2792745533489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2792779087421) 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 in 2 ways as a sum of consecutive naturals, for example, 835581 + ... + 2506741.

Almost surely, 2^{2792779087921} is an apocalyptic number.

2792779087921 is the 1671161-st square number.

2792779087921 is the 835581-st centered octagonal number.

It is an amenable number.

2792779087921 is a deficient number, since it is larger than the sum of its proper divisors (1671162).

2792779087921 is an frugal number, since it uses more digits than its factorization.

2792779087921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342322 (or 1671161 counting only the distinct ones).

The product of its (nonzero) digits is 112021056, while the sum is 70.

The spelling of 2792779087921 in words is "two trillion, seven hundred ninety-two billion, seven hundred seventy-nine million, eighty-seven thousand, nine hundred twenty-one".