1992818881 has 3 divisors (see below), whose sum is σ = 1992863523. Its totient is φ = 1992774240.

The previous prime is 1992818873. The next prime is 1992818887. The reversal of 1992818881 is 1888182991.

The square root of 1992818881 is 44641.

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., 1489265281 + 503553600 = 38591^2 + 22440^2 .

It is not a de Polignac number, because 1992818881 - 2³ = 1992818873 is a prime.

It is a super-2 number, since 2×1992818881² = 7942654184940184322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992818887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22321 + ... + 66961.

It is an arithmetic number, because the mean of its divisors is an integer number (664287841).

Almost surely, 2^1992818881 is an apocalyptic number.

1992818881 is the 44641-st square number.

1992818881 is the 22321-st centered octagonal number.

It is an amenable number.

1992818881 is a deficient number, since it is larger than the sum of its proper divisors (44642).

1992818881 is an frugal number, since it uses more digits than its factorization.

1992818881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89282 (or 44641 counting only the distinct ones).

The product of its digits is 663552, while the sum is 55.

The cubic root of 1992818881 is about 1258.4113010045.

It can be divided in two parts, 19928 and 18881, that added together give a square (38809 = 197²).

The spelling of 1992818881 in words is "one billion, nine hundred ninety-two million, eight hundred eighteen thousand, eight hundred eighty-one".