198428501 has 4 divisors (see below), whose sum is σ = 202650432. Its totient is φ = 194206572.

The previous prime is 198428453. The next prime is 198428507. The reversal of 198428501 is 105824891.

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 198428501 - 2¹⁸ = 198166357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198428507) 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, 2110895 + ... + 2110988.

It is an arithmetic number, because the mean of its divisors is an integer number (50662608).

Almost surely, 2^198428501 is an apocalyptic number.

It is an amenable number.

198428501 is a deficient number, since it is larger than the sum of its proper divisors (4221931).

198428501 is an equidigital number, since it uses as much as digits as its factorization.

198428501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221930.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 198428501 is about 14086.4651705103. The cubic root of 198428501 is about 583.2678212868.

The spelling of 198428501 in words is "one hundred ninety-eight million, four hundred twenty-eight thousand, five hundred one".