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12982181 is a prime number
BaseRepresentation
bin110001100001…
…011110100101
3220102120012112
4301201132211
511310412211
61142130405
7215226632
oct61413645
926376175
1012982181
117367783
124420a05
1328c7084
141a1d189
15121688b
hexc617a5

12982181 has 2 divisors, whose sum is σ = 12982182. Its totient is φ = 12982180.

The previous prime is 12982171. The next prime is 12982213. The reversal of 12982181 is 18128921.

12982181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12982213) can be obtained adding 12982181 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8031556 + 4950625 = 2834^2 + 2225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12982181 is a prime.

It is a super-2 number, since 2×129821812 = 337074047033522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12982141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6491090 + 6491091.

It is an arithmetic number, because the mean of its divisors is an integer number (6491091).

Almost surely, 212982181 is an apocalyptic number.

It is an amenable number.

12982181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12982181 is an equidigital number, since it uses as much as digits as its factorization.

12982181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 32.

The square root of 12982181 is about 3603.0793774215. The cubic root of 12982181 is about 235.0259877703.

The spelling of 12982181 in words is "twelve million, nine hundred eighty-two thousand, one hundred eighty-one".