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BaseRepresentation
bin111011100110100…
…111110010110101
32120200122020222012
4323212213302311
54021443331323
6243121014005
733531456131
oct7346476265
92520566865
10999980213
1147350aa31
1223aa84305
1312c23118b
1496b443c1
155cbca678
hex3b9a7cb5

999980213 has 2 divisors, whose sum is σ = 999980214. Its totient is φ = 999980212.

The previous prime is 999980209. The next prime is 999980231. The reversal of 999980213 is 312089999.

Together with next prime (999980231) 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., 804176164 + 195804049 = 28358^2 + 13993^2 .

It is a cyclic number.

It is not a de Polignac number, because 999980213 - 22 = 999980209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999982213) 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, 499990106 + 499990107.

It is an arithmetic number, because the mean of its divisors is an integer number (499990107).

Almost surely, 2999980213 is an apocalyptic number.

It is an amenable number.

999980213 is a deficient number, since it is larger than the sum of its proper divisors (1).

999980213 is an equidigital number, since it uses as much as digits as its factorization.

999980213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 999980213 is about 31622.4637401958. The cubic root of 999980213 is about 999.9934042898.

The spelling of 999980213 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, two hundred thirteen".