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199995979 is a prime number
BaseRepresentation
bin10111110101110…
…11001001001011
3111221022211220111
423322323021023
5402144332404
631502335151
74645636441
oct1372731113
9457284814
10199995979
11a298aa37
1256b8a4b7
1332585521
141c7c0b91
1512858104
hexbebb24b

199995979 has 2 divisors, whose sum is σ = 199995980. Its totient is φ = 199995978.

The previous prime is 199995959. The next prime is 199996051. The reversal of 199995979 is 979599991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199995979 - 211 = 199993931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199995949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997989 + 99997990.

It is an arithmetic number, because the mean of its divisors is an integer number (99997990).

Almost surely, 2199995979 is an apocalyptic number.

199995979 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995979 is an equidigital number, since it uses as much as digits as its factorization.

199995979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18600435, while the sum is 67.

The square root of 199995979 is about 14141.9934591980. The cubic root of 199995979 is about 584.7996284579.

The spelling of 199995979 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred seventy-nine".