198861329 has 4 divisors (see below), whose sum is σ = 202231920. Its totient is φ = 195490740.

The previous prime is 198861317. The next prime is 198861331. The reversal of 198861329 is 923168891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198861329 - 2¹² = 198857233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198861389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1685207 + ... + 1685324.

It is an arithmetic number, because the mean of its divisors is an integer number (50557980).

Almost surely, 2^198861329 is an apocalyptic number.

It is an amenable number.

198861329 is a deficient number, since it is larger than the sum of its proper divisors (3370591).

198861329 is an equidigital number, since it uses as much as digits as its factorization.

198861329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370590.

The product of its digits is 186624, while the sum is 47.

The square root of 198861329 is about 14101.8200598362. The cubic root of 198861329 is about 583.6916033332.

The spelling of 198861329 in words is "one hundred ninety-eight million, eight hundred sixty-one thousand, three hundred twenty-nine".