198129901 has 4 divisors (see below), whose sum is σ = 198201600. Its totient is φ = 198058204.

The previous prime is 198129871. The next prime is 198129907. The reversal of 198129901 is 109921891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 109921891 = 599 ⋅183509.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198129901 is a prime.

It is a super-3 number, since 3×198129901³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198129907) 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, 31531 + ... + 37288.

It is an arithmetic number, because the mean of its divisors is an integer number (49550400).

Almost surely, 2^198129901 is an apocalyptic number.

It is an amenable number.

198129901 is a deficient number, since it is larger than the sum of its proper divisors (71699).

198129901 is an equidigital number, since it uses as much as digits as its factorization.

198129901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71698.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 198129901 is about 14075.8623536890. The cubic root of 198129901 is about 582.9751025735.

The spelling of 198129901 in words is "one hundred ninety-eight million, one hundred twenty-nine thousand, nine hundred one".