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78995321 is a prime number
BaseRepresentation
bin1001011010101…
…01111101111001
312111122101012122
410231111331321
5130210322241
611501051025
71646310026
oct455257571
9174571178
1078995321
1140655399
1222556a75
131349acc2
14a6c454d
156e0604b
hex4b55f79

78995321 has 2 divisors, whose sum is σ = 78995322. Its totient is φ = 78995320.

The previous prime is 78995291. The next prime is 78995341. The reversal of 78995321 is 12359987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63282025 + 15713296 = 7955^2 + 3964^2 .

It is an emirp because it is prime and its reverse (12359987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-78995321 is a prime.

It is not a weakly prime, because it can be changed into another prime (78995341) 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, 39497660 + 39497661.

It is an arithmetic number, because the mean of its divisors is an integer number (39497661).

Almost surely, 278995321 is an apocalyptic number.

It is an amenable number.

78995321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78995321 is an equidigital number, since it uses as much as digits as its factorization.

78995321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 78995321 is about 8887.9311991036. The cubic root of 78995321 is about 429.0755712939.

The spelling of 78995321 in words is "seventy-eight million, nine hundred ninety-five thousand, three hundred twenty-one".