198158401 has 6 divisors (see below), whose sum is σ = 230510850. Its totient is φ = 169850016.

The previous prime is 198158393. The next prime is 198158419. The reversal of 198158401 is 104851891.

198158401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 130507776 + 67650625 = 11424^2 + 8225^2 .

It is not a de Polignac number, because 198158401 - 2³ = 198158393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198158801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2021976 + ... + 2022073.

It is an arithmetic number, because the mean of its divisors is an integer number (38418475).

Almost surely, 2^198158401 is an apocalyptic number.

It is an amenable number.

198158401 is a deficient number, since it is larger than the sum of its proper divisors (32352449).

198158401 is an equidigital number, since it uses as much as digits as its factorization.

198158401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044063 (or 4044056 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 198158401 is about 14076.8746886516. The cubic root of 198158401 is about 583.0030539222.

The spelling of 198158401 in words is "one hundred ninety-eight million, one hundred fifty-eight thousand, four hundred one".