212475281 has 2 divisors, whose sum is σ = 212475282. Its totient is φ = 212475280.

The previous prime is 212475229. The next prime is 212475287. The reversal of 212475281 is 182574212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170433025 + 42042256 = 13055^2 + 6484^2 .

It is a cyclic number.

It is not a de Polignac number, because 212475281 - 2²² = 208280977 is a prime.

It is a super-2 number, since 2×212475281² = 90291490072057922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212475287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106237640 + 106237641.

It is an arithmetic number, because the mean of its divisors is an integer number (106237641).

Almost surely, 2^212475281 is an apocalyptic number.

It is an amenable number.

212475281 is a deficient number, since it is larger than the sum of its proper divisors (1).

212475281 is an equidigital number, since it uses as much as digits as its factorization.

212475281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 212475281 is about 14576.5318577500. The cubic root of 212475281 is about 596.7184564695.

The spelling of 212475281 in words is "two hundred twelve million, four hundred seventy-five thousand, two hundred eighty-one".