198356492720281 has 9 divisors (see below), whose sum is σ = 230741340908949. Its totient is φ = 170019766399644.

The previous prime is 198356492720233. The next prime is 198356492720291. The reversal of 198356492720281 is 182027294653891.

The square root of 198356492720281 is 14083909.

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

It is not a de Polignac number, because 198356492720281 - 2⁹ = 198356492719769 is a prime.

It is a super-2 number, since 2×198356492720281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198356492720291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 97581370 + ... + 99593356.

It is an arithmetic number, because the mean of its divisors is an integer number (25637926767661).

It is a 2-persistent number, because it is pandigital, and so is 2⋅198356492720281 = 396712985440562, but 3⋅198356492720281 = 595069478160843 is not.

Almost surely, 2^{198356492720281} is an apocalyptic number.

198356492720281 is the 14083909-th square number.

198356492720281 is the 7041955-th centered octagonal number.

It is an amenable number.

198356492720281 is a deficient number, since it is larger than the sum of its proper divisors (32384848188668).

198356492720281 is an frugal number, since it uses more digits than its factorization.

198356492720281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023988 (or 2011994 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 67.

The spelling of 198356492720281 in words is "one hundred ninety-eight trillion, three hundred fifty-six billion, four hundred ninety-two million, seven hundred twenty thousand, two hundred eighty-one".