198155051 has 16 divisors (see below), whose sum is σ = 212889600. Its totient is φ = 183986880.

The previous prime is 198155033. The next prime is 198155059. The reversal of 198155051 is 150551891.

It is a cyclic number.

It is not a de Polignac number, because 198155051 - 2⁶ = 198154987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198155059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188375 + ... + 189423.

It is an arithmetic number, because the mean of its divisors is an integer number (13305600).

Almost surely, 2^198155051 is an apocalyptic number.

198155051 is a deficient number, since it is larger than the sum of its proper divisors (14734549).

198155051 is a wasteful number, since it uses less digits than its factorization.

198155051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306.

The product of its (nonzero) digits is 9000, while the sum is 35.

The square root of 198155051 is about 14076.7556986686. The cubic root of 198155051 is about 582.9997685518. Note that the first 3 decimals are identical.

The spelling of 198155051 in words is "one hundred ninety-eight million, one hundred fifty-five thousand, fifty-one".