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821197469 is a prime number
BaseRepresentation
bin110000111100100…
…111101010011101
32010020020011011002
4300330213222131
53140211304334
6213253040045
726231030501
oct6074475235
92106204132
10821197469
113915a98a4
121ab026025
13101195381
147b0c6301
154c162b7e
hex30f27a9d

821197469 has 2 divisors, whose sum is σ = 821197470. Its totient is φ = 821197468.

The previous prime is 821197463. The next prime is 821197483. The reversal of 821197469 is 964791128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559890244 + 261307225 = 23662^2 + 16165^2 .

It is a cyclic number.

It is not a de Polignac number, because 821197469 - 28 = 821197213 is a prime.

It is a super-2 number, since 2×8211974692 = 1348730566184011922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821197463) 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, 410598734 + 410598735.

It is an arithmetic number, because the mean of its divisors is an integer number (410598735).

Almost surely, 2821197469 is an apocalyptic number.

It is an amenable number.

821197469 is a deficient number, since it is larger than the sum of its proper divisors (1).

821197469 is an equidigital number, since it uses as much as digits as its factorization.

821197469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 821197469 is about 28656.5432144214. The cubic root of 821197469 is about 936.4455582726.

The spelling of 821197469 in words is "eight hundred twenty-one million, one hundred ninety-seven thousand, four hundred sixty-nine".