211165231 has 4 divisors (see below), whose sum is σ = 220346352. Its totient is φ = 201984112.

The previous prime is 211165193. The next prime is 211165243. The reversal of 211165231 is 132561112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211165231 - 2¹⁵ = 211132463 is a prime.

It is a super-2 number, since 2×211165231² = 89181509566566722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211165291) 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, 4590526 + ... + 4590571.

It is an arithmetic number, because the mean of its divisors is an integer number (55086588).

Almost surely, 2^211165231 is an apocalyptic number.

211165231 is a deficient number, since it is larger than the sum of its proper divisors (9181121).

211165231 is an equidigital number, since it uses as much as digits as its factorization.

211165231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9181120.

The product of its digits is 360, while the sum is 22.

The square root of 211165231 is about 14531.5254188953. The cubic root of 211165231 is about 595.4895399182.

The spelling of 211165231 in words is "two hundred eleven million, one hundred sixty-five thousand, two hundred thirty-one".