1992845221 has 4 divisors (see below), whose sum is σ = 2041451244. Its totient is φ = 1944239200.

The previous prime is 1992845207. The next prime is 1992845227. The reversal of 1992845221 is 1225482991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1009332900 + 983512321 = 31770^2 + 31361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992845221 - 2²³ = 1984456613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992845227) 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 3 ways as a sum of consecutive naturals, for example, 24302950 + ... + 24303031.

It is an arithmetic number, because the mean of its divisors is an integer number (510362811).

Almost surely, 2^1992845221 is an apocalyptic number.

It is an amenable number.

1992845221 is a deficient number, since it is larger than the sum of its proper divisors (48606023).

1992845221 is an equidigital number, since it uses as much as digits as its factorization.

1992845221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48606022.

The product of its digits is 103680, while the sum is 43.

The square root of 1992845221 is about 44641.2950192980. The cubic root of 1992845221 is about 1258.4168453129.

The spelling of 1992845221 in words is "one billion, nine hundred ninety-two million, eight hundred forty-five thousand, two hundred twenty-one".