198792031321 has 9 divisors (see below), whose sum is σ = 215266286781. Its totient is φ = 183494986272.

The previous prime is 198792031271. The next prime is 198792031337. The reversal of 198792031321 is 123130297891.

The square root of 198792031321 is 445861.

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

It can be written as a sum of positive squares in 4 ways, for example, as 5526286921 + 193265744400 = 74339^2 + 439620^2 .

It is not a de Polignac number, because 198792031321 - 2¹¹ = 198792029273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198792031381) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5779045 + ... + 5813341.

It is an arithmetic number, because the mean of its divisors is an integer number (23918476309).

Almost surely, 2^198792031321 is an apocalyptic number.

198792031321 is the 445861-st square number.

198792031321 is the 222931-st centered octagonal number.

It is an amenable number.

198792031321 is a deficient number, since it is larger than the sum of its proper divisors (16474255460).

198792031321 is an frugal number, since it uses more digits than its factorization.

198792031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68620 (or 34310 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

It can be divided in two parts, 1987920 and 31321, that added together give a square (2019241 = 1421²).

The spelling of 198792031321 in words is "one hundred ninety-eight billion, seven hundred ninety-two million, thirty-one thousand, three hundred twenty-one".