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199800091 is a prime number
BaseRepresentation
bin10111110100010…
…11010100011011
3111220221220012101
423322023110123
5402122100331
631454224231
74644162361
oct1372132433
9456856171
10199800091
11a2866847
1256ab5077
133251730a
141c76d631
151281a061
hexbe8b51b

199800091 has 2 divisors, whose sum is σ = 199800092. Its totient is φ = 199800090.

The previous prime is 199800049. The next prime is 199800101. The reversal of 199800091 is 190008991.

It is a strong prime.

It is an emirp because it is prime and its reverse (190008991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 160008661 and 166800061.

It is a cyclic number.

It is not a de Polignac number, because 199800091 - 225 = 166245659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199800091.

It is not a weakly prime, because it can be changed into another prime (199800191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99900045 + 99900046.

It is an arithmetic number, because the mean of its divisors is an integer number (99900046).

Almost surely, 2199800091 is an apocalyptic number.

199800091 is a deficient number, since it is larger than the sum of its proper divisors (1).

199800091 is an equidigital number, since it uses as much as digits as its factorization.

199800091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 199800091 is about 14135.0660062131. The cubic root of 199800091 is about 584.6086368668.

The spelling of 199800091 in words is "one hundred ninety-nine million, eight hundred thousand, ninety-one".