211487117 has 2 divisors, whose sum is σ = 211487118. Its totient is φ = 211487116.

The previous prime is 211487113. The next prime is 211487147. The reversal of 211487117 is 711784112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199967881 + 11519236 = 14141^2 + 3394^2 .

It is a cyclic number.

It is not a de Polignac number, because 211487117 - 2² = 211487113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211487113) 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, 105743558 + 105743559.

It is an arithmetic number, because the mean of its divisors is an integer number (105743559).

Almost surely, 2^211487117 is an apocalyptic number.

It is an amenable number.

211487117 is a deficient number, since it is larger than the sum of its proper divisors (1).

211487117 is an equidigital number, since it uses as much as digits as its factorization.

211487117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 32.

The square root of 211487117 is about 14542.5966388400. The cubic root of 211487117 is about 595.7919609702.

The spelling of 211487117 in words is "two hundred eleven million, four hundred eighty-seven thousand, one hundred seventeen".