211862117 has 2 divisors, whose sum is σ = 211862118. Its totient is φ = 211862116.

The previous prime is 211862087. The next prime is 211862213. The reversal of 211862117 is 711268112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145781476 + 66080641 = 12074^2 + 8129^2 .

It is a cyclic number.

It is not a de Polignac number, because 211862117 - 2²² = 207667813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211862117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211862317) 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, 105931058 + 105931059.

It is an arithmetic number, because the mean of its divisors is an integer number (105931059).

Almost surely, 2^211862117 is an apocalyptic number.

It is an amenable number.

211862117 is a deficient number, since it is larger than the sum of its proper divisors (1).

211862117 is an equidigital number, since it uses as much as digits as its factorization.

211862117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 29.

The square root of 211862117 is about 14555.4840867626. The cubic root of 211862117 is about 596.1438973975.

The spelling of 211862117 in words is "two hundred eleven million, eight hundred sixty-two thousand, one hundred seventeen".