211323989 has 2 divisors, whose sum is σ = 211323990. Its totient is φ = 211323988.

The previous prime is 211323961. The next prime is 211324013. The reversal of 211323989 is 989323112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181980100 + 29343889 = 13490^2 + 5417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211323989 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 (211323949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105661994 + 105661995.

It is an arithmetic number, because the mean of its divisors is an integer number (105661995).

Almost surely, 2^211323989 is an apocalyptic number.

It is an amenable number.

211323989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211323989 is an equidigital number, since it uses as much as digits as its factorization.

211323989 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 211323989 is about 14536.9869298971. The cubic root of 211323989 is about 595.6387359543.

The spelling of 211323989 in words is "two hundred eleven million, three hundred twenty-three thousand, nine hundred eighty-nine".