7819522988281 has 3 divisors (see below), whose sum is σ = 7819525784623. Its totient is φ = 7819520191940.

The previous prime is 7819522988269. The next prime is 7819522988287. The reversal of 7819522988281 is 1828892259187.

The square root of 7819522988281 is 2796341.

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., 6876410088681 + 943112899600 = 2622291^2 + 971140^2 .

It is not a de Polignac number, because 7819522988281 - 2¹³ = 7819522980089 is a prime.

It is a super-2 number, since 2×7819522988281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7819522988281.

It is not an unprimeable number, because it can be changed into a prime (7819522988287) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1398171 + ... + 4194511.

Almost surely, 2^{7819522988281} is an apocalyptic number.

7819522988281 is the 2796341-st square number.

7819522988281 is the 1398171-st centered octagonal number.

It is an amenable number.

7819522988281 is a deficient number, since it is larger than the sum of its proper divisors (2796342).

7819522988281 is an frugal number, since it uses more digits than its factorization.

7819522988281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592682 (or 2796341 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 70.

The spelling of 7819522988281 in words is "seven trillion, eight hundred nineteen billion, five hundred twenty-two million, nine hundred eighty-eight thousand, two hundred eighty-one".