212287081 has 2 divisors, whose sum is σ = 212287082. Its totient is φ = 212287080.

The previous prime is 212287067. The next prime is 212287121. The reversal of 212287081 is 180782212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211440681 + 846400 = 14541^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 212287081 - 2¹⁵ = 212254313 is a prime.

It is a super-3 number, since 3×212287081³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212287051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106143540 + 106143541.

It is an arithmetic number, because the mean of its divisors is an integer number (106143541).

Almost surely, 2^212287081 is an apocalyptic number.

It is an amenable number.

212287081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212287081 is an equidigital number, since it uses as much as digits as its factorization.

212287081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 212287081 is about 14570.0748453809. The cubic root of 212287081 is about 596.5422232836.

The spelling of 212287081 in words is "two hundred twelve million, two hundred eighty-seven thousand, eighty-one".