211111097 has 8 divisors (see below), whose sum is σ = 219861000. Its totient is φ = 202459264.

The previous prime is 211111079. The next prime is 211111129. The reversal of 211111097 is 790111112.

It is a happy number.

211111097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 59845696 + 151265401 = 7736^2 + 12299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211111097 - 2¹⁰ = 211110073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20108 + ... + 28749.

It is an arithmetic number, because the mean of its divisors is an integer number (27482625).

Almost surely, 2^211111097 is an apocalyptic number.

It is an amenable number.

211111097 is a deficient number, since it is larger than the sum of its proper divisors (8749903).

211111097 is a wasteful number, since it uses less digits than its factorization.

211111097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49035.

The product of its (nonzero) digits is 126, while the sum is 23.

The square root of 211111097 is about 14529.6626595389. The cubic root of 211111097 is about 595.4386493026.

The spelling of 211111097 in words is "two hundred eleven million, one hundred eleven thousand, ninety-seven".