212887117 has 2 divisors, whose sum is σ = 212887118. Its totient is φ = 212887116.

The previous prime is 212887079. The next prime is 212887121. The reversal of 212887117 is 711788212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157101156 + 55785961 = 12534^2 + 7469^2 .

It is a cyclic number.

It is not a de Polignac number, because 212887117 - 2²³ = 204498509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212887127) 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, 106443558 + 106443559.

It is an arithmetic number, because the mean of its divisors is an integer number (106443559).

Almost surely, 2^212887117 is an apocalyptic number.

It is an amenable number.

212887117 is a deficient number, since it is larger than the sum of its proper divisors (1).

212887117 is an equidigital number, since it uses as much as digits as its factorization.

212887117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 37.

The square root of 212887117 is about 14590.6516989475. The cubic root of 212887117 is about 597.1037429125.

The spelling of 212887117 in words is "two hundred twelve million, eight hundred eighty-seven thousand, one hundred seventeen".