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1111131821 is a prime number
BaseRepresentation
bin100001000111010…
…1000011010101101
32212102210100022102
41002032220122231
54233422204241
6302131224445
736351315242
oct10216503255
92772710272
101111131821
11520228868
12270148125
1314927a767
14a77d95c9
156783439b
hex423a86ad

1111131821 has 2 divisors, whose sum is σ = 1111131822. Its totient is φ = 1111131820.

The previous prime is 1111131773. The next prime is 1111131869. The reversal of 1111131821 is 1281311111.

It is a m-pointer prime, because the next prime (1111131869) can be obtained adding 1111131821 to its product of digits (48).

It is a balanced prime because it is at equal distance from previous prime (1111131773) and next prime (1111131869).

It can be written as a sum of positive squares in only one way, i.e., 640849225 + 470282596 = 25315^2 + 21686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111131821 - 218 = 1110869677 is a prime.

It is a super-2 number, since 2×11111318212 = 2469227847277552082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111131793 and 1111131802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111131871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555565910 + 555565911.

It is an arithmetic number, because the mean of its divisors is an integer number (555565911).

Almost surely, 21111131821 is an apocalyptic number.

It is an amenable number.

1111131821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111131821 is an equidigital number, since it uses as much as digits as its factorization.

1111131821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 20.

The square root of 1111131821 is about 33333.6439802191. The cubic root of 1111131821 is about 1035.7506036553.

Adding to 1111131821 its reverse (1281311111), we get a palindrome (2392442932).

The spelling of 1111131821 in words is "one billion, one hundred eleven million, one hundred thirty-one thousand, eight hundred twenty-one".