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68111821 is a prime number
BaseRepresentation
bin1000000111101…
…00110111001101
311202011102212001
410003310313031
5114414034241
610431512301
71454640511
oct403646715
9152142761
1068111821
11354a1468
121a988691
131115a26b
149090141
155ea6431
hex40f4dcd

68111821 has 2 divisors, whose sum is σ = 68111822. Its totient is φ = 68111820.

The previous prime is 68111801. The next prime is 68111833. The reversal of 68111821 is 12811186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35462025 + 32649796 = 5955^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 68111821 - 211 = 68109773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68111821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68111801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34055910 + 34055911.

It is an arithmetic number, because the mean of its divisors is an integer number (34055911).

Almost surely, 268111821 is an apocalyptic number.

It is an amenable number.

68111821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68111821 is an equidigital number, since it uses as much as digits as its factorization.

68111821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 28.

The square root of 68111821 is about 8252.9886101945. The cubic root of 68111821 is about 408.3891203894.

The spelling of 68111821 in words is "sixty-eight million, one hundred eleven thousand, eight hundred twenty-one".