211031113 has 4 divisors (see below), whose sum is σ = 211168900. Its totient is φ = 210893328.

The previous prime is 211031111. The next prime is 211031123. The reversal of 211031113 is 311130112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85322169 + 125708944 = 9237^2 + 11212^2 .

It is a cyclic number.

It is not a de Polignac number, because 211031113 - 2¹ = 211031111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211031093 and 211031102.

It is not an unprimeable number, because it can be changed into a prime (211031111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66570 + ... + 69667.

It is an arithmetic number, because the mean of its divisors is an integer number (52792225).

Almost surely, 2^211031113 is an apocalyptic number.

It is an amenable number.

211031113 is a deficient number, since it is larger than the sum of its proper divisors (137787).

211031113 is a wasteful number, since it uses less digits than its factorization.

211031113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137786.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 211031113 is about 14526.9099604837. The cubic root of 211031113 is about 595.3634415383.

Adding to 211031113 its reverse (311130112), we get a palindrome (522161225).

The spelling of 211031113 in words is "two hundred eleven million, thirty-one thousand, one hundred thirteen".