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199998157 is a prime number
BaseRepresentation
bin10111110101110…
…11101011001101
3111221022221220011
423322323223031
5402144420112
631502353221
74645646002
oct1372735315
9457287804
10199998157
11a2991637
1256b8b811
1332586508
141c7c18a9
1512858aa7
hexbebbacd

199998157 has 2 divisors, whose sum is σ = 199998158. Its totient is φ = 199998156.

The previous prime is 199998131. The next prime is 199998187. The reversal of 199998157 is 751899991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199967881 + 30276 = 14141^2 + 174^2 .

It is an emirp because it is prime and its reverse (751899991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199998157 - 223 = 191609549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199998107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999078 + 99999079.

It is an arithmetic number, because the mean of its divisors is an integer number (99999079).

Almost surely, 2199998157 is an apocalyptic number.

It is an amenable number.

199998157 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998157 is an equidigital number, since it uses as much as digits as its factorization.

199998157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 58.

The square root of 199998157 is about 14142.0704636910. The cubic root of 199998157 is about 584.8017513155.

The spelling of 199998157 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred fifty-seven".