198505251 has 12 divisors (see below), whose sum is σ = 327691312. Its totient is φ = 113431536.

The previous prime is 198505247. The next prime is 198505283. The reversal of 198505251 is 152505891.

It is a happy number.

It is not a de Polignac number, because 198505251 - 2² = 198505247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198505211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1575376 + ... + 1575501.

Almost surely, 2^198505251 is an apocalyptic number.

198505251 is a deficient number, since it is larger than the sum of its proper divisors (129186061).

198505251 is a wasteful number, since it uses less digits than its factorization.

198505251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150890 (or 3150887 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 198505251 is about 14089.1891533899. The cubic root of 198505251 is about 583.3430121569.

The spelling of 198505251 in words is "one hundred ninety-eight million, five hundred five thousand, two hundred fifty-one".