211283993 has 2 divisors, whose sum is σ = 211283994. Its totient is φ = 211283992.

The previous prime is 211283959. The next prime is 211284037. The reversal of 211283993 is 399382112.

211283993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188320729 + 22963264 = 13723^2 + 4792^2 .

It is a cyclic number.

It is not a de Polignac number, because 211283993 - 2¹⁰ = 211282969 is a prime.

It is not a weakly prime, because it can be changed into another prime (211283393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105641996 + 105641997.

It is an arithmetic number, because the mean of its divisors is an integer number (105641997).

Almost surely, 2^211283993 is an apocalyptic number.

It is an amenable number.

211283993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211283993 is an equidigital number, since it uses as much as digits as its factorization.

211283993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 211283993 is about 14535.6112014597. The cubic root of 211283993 is about 595.6011559488.

The spelling of 211283993 in words is "two hundred eleven million, two hundred eighty-three thousand, nine hundred ninety-three".