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BaseRepresentation
bin110000001101001…
…000000110011101
32002100210121220012
4300031020012131
53124014404141
6212130133005
726020145126
oct6015100635
92070717805
10808747421
113855759a9
121a6a21165
13cb726591
14795a504d
154b003ceb
hex3034819d

808747421 has 2 divisors, whose sum is σ = 808747422. Its totient is φ = 808747420.

The previous prime is 808747403. The next prime is 808747463. The reversal of 808747421 is 124747808.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807184921 + 1562500 = 28411^2 + 1250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-808747421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808747481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404373710 + 404373711.

It is an arithmetic number, because the mean of its divisors is an integer number (404373711).

Almost surely, 2808747421 is an apocalyptic number.

It is an amenable number.

808747421 is a deficient number, since it is larger than the sum of its proper divisors (1).

808747421 is an equidigital number, since it uses as much as digits as its factorization.

808747421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 808747421 is about 28438.4848576713. The cubic root of 808747421 is about 931.6890033755.

The spelling of 808747421 in words is "eight hundred eight million, seven hundred forty-seven thousand, four hundred twenty-one".