211391113 has 2 divisors, whose sum is σ = 211391114. Its totient is φ = 211391112.

The previous prime is 211391099. The next prime is 211391129. The reversal of 211391113 is 311193112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211062784 + 328329 = 14528^2 + 573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211391113 is a prime.

It is not a weakly prime, because it can be changed into another prime (211391143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105695556 + 105695557.

It is an arithmetic number, because the mean of its divisors is an integer number (105695557).

Almost surely, 2^211391113 is an apocalyptic number.

It is an amenable number.

211391113 is a deficient number, since it is larger than the sum of its proper divisors (1).

211391113 is an equidigital number, since it uses as much as digits as its factorization.

211391113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 22.

The square root of 211391113 is about 14539.2954781172. The cubic root of 211391113 is about 595.7017946133.

The spelling of 211391113 in words is "two hundred eleven million, three hundred ninety-one thousand, one hundred thirteen".