211509983 has 2 divisors, whose sum is σ = 211509984. Its totient is φ = 211509982.

The previous prime is 211509959. The next prime is 211509989. The reversal of 211509983 is 389905112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211509983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211509989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105754991 + 105754992.

It is an arithmetic number, because the mean of its divisors is an integer number (105754992).

Almost surely, 2^211509983 is an apocalyptic number.

211509983 is a deficient number, since it is larger than the sum of its proper divisors (1).

211509983 is an equidigital number, since it uses as much as digits as its factorization.

211509983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 211509983 is about 14543.3827908090. The cubic root of 211509983 is about 595.8134325507.

The spelling of 211509983 in words is "two hundred eleven million, five hundred nine thousand, nine hundred eighty-three".