198818251 has 2 divisors, whose sum is σ = 198818252. Its totient is φ = 198818250.

The previous prime is 198818231. The next prime is 198818267. The reversal of 198818251 is 152818891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198818251 - 2⁹ = 198817739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198818198 and 198818207.

It is not a weakly prime, because it can be changed into another prime (198818231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99409125 + 99409126.

It is an arithmetic number, because the mean of its divisors is an integer number (99409126).

Almost surely, 2^198818251 is an apocalyptic number.

198818251 is a deficient number, since it is larger than the sum of its proper divisors (1).

198818251 is an equidigital number, since it uses as much as digits as its factorization.

198818251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 43.

The square root of 198818251 is about 14100.2925856168. The cubic root of 198818251 is about 583.6494532198.

The spelling of 198818251 in words is "one hundred ninety-eight million, eight hundred eighteen thousand, two hundred fifty-one".