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199109681 is a prime number
BaseRepresentation
bin10111101111000…
…10110000110001
3111212122211010122
423313202300301
5401433002211
631431340025
74635255461
oct1367426061
9455584118
10199109681
11a2435061
1256821615
1332334ca4
141c62dba1
15127306db
hexbde2c31

199109681 has 2 divisors, whose sum is σ = 199109682. Its totient is φ = 199109680.

The previous prime is 199109663. The next prime is 199109699. The reversal of 199109681 is 186901991.

It is a balanced prime because it is at equal distance from previous prime (199109663) and next prime (199109699).

It can be written as a sum of positive squares in only one way, i.e., 197149681 + 1960000 = 14041^2 + 1400^2 .

It is an emirp because it is prime and its reverse (186901991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 189601661 and 166106981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-199109681 is a prime.

It is a super-2 number, since 2×1991096812 = 79289330135843522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199109881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99554840 + 99554841.

It is an arithmetic number, because the mean of its divisors is an integer number (99554841).

Almost surely, 2199109681 is an apocalyptic number.

It is an amenable number.

199109681 is a deficient number, since it is larger than the sum of its proper divisors (1).

199109681 is an equidigital number, since it uses as much as digits as its factorization.

199109681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 199109681 is about 14110.6229841209. The cubic root of 199109681 is about 583.9344872796.

The spelling of 199109681 in words is "one hundred ninety-nine million, one hundred nine thousand, six hundred eighty-one".