198722129 has 4 divisors (see below), whose sum is σ = 210411684. Its totient is φ = 187032576.

The previous prime is 198722101. The next prime is 198722131. The reversal of 198722129 is 921227891.

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 54169600 + 144552529 = 7360^2 + 12023^2 .

It is a cyclic number.

It is not a de Polignac number, because 198722129 - 2¹⁶ = 198656593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198722189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5844752 + ... + 5844785.

It is an arithmetic number, because the mean of its divisors is an integer number (52602921).

Almost surely, 2^198722129 is an apocalyptic number.

It is an amenable number.

198722129 is a deficient number, since it is larger than the sum of its proper divisors (11689555).

198722129 is a wasteful number, since it uses less digits than its factorization.

198722129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689554.

The product of its digits is 36288, while the sum is 41.

The square root of 198722129 is about 14096.8836627107. The cubic root of 198722129 is about 583.5553797029. Note that the first 3 decimals are identical.

The spelling of 198722129 in words is "one hundred ninety-eight million, seven hundred twenty-two thousand, one hundred twenty-nine".