198551417 has 2 divisors, whose sum is σ = 198551418. Its totient is φ = 198551416.

The previous prime is 198551407. The next prime is 198551471. The reversal of 198551417 is 714155891.

It is a happy number.

Together with next prime (198551471) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197936761 + 614656 = 14069^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 198551417 - 2⁸ = 198551161 is a prime.

It is not a weakly prime, because it can be changed into another prime (198551407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99275708 + 99275709.

It is an arithmetic number, because the mean of its divisors is an integer number (99275709).

Almost surely, 2^198551417 is an apocalyptic number.

It is an amenable number.

198551417 is a deficient number, since it is larger than the sum of its proper divisors (1).

198551417 is an equidigital number, since it uses as much as digits as its factorization.

198551417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 41.

The square root of 198551417 is about 14090.8274065081. The cubic root of 198551417 is about 583.3882309876.

The spelling of 198551417 in words is "one hundred ninety-eight million, five hundred fifty-one thousand, four hundred seventeen".