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BaseRepresentation
bin11001010010010…
…01001100100001
3112210010102011222
430221021030201
5413300042121
633014144425
75153631542
oct1451111441
9483112158
10212112161
11a9806008
125b052115
1334c38371
14202564c9
151394d0ab
hexca49321

212112161 has 2 divisors, whose sum is σ = 212112162. Its totient is φ = 212112160.

The previous prime is 212112091. The next prime is 212112167. The reversal of 212112161 is 161211212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199374400 + 12737761 = 14120^2 + 3569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-212112161 is a prime.

It is not a weakly prime, because it can be changed into another prime (212112167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056080 + 106056081.

It is an arithmetic number, because the mean of its divisors is an integer number (106056081).

Almost surely, 2212112161 is an apocalyptic number.

It is an amenable number.

212112161 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112161 is an equidigital number, since it uses as much as digits as its factorization.

212112161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 212112161 is about 14564.0708938126. The cubic root of 212112161 is about 596.3783322635.

Adding to 212112161 its reverse (161211212), we get a palindrome (373323373).

The spelling of 212112161 in words is "two hundred twelve million, one hundred twelve thousand, one hundred sixty-one".