231211 has 8 divisors (see below), whose sum is σ = 249920. Its totient is φ = 213192.

The previous prime is 231197. The next prime is 231223. The reversal of 231211 is 112132.

231211 = T₂₆ + T₂₇ + ... + T₁₁₁.

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 231211 - 2¹³ = 223019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231241) 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, 676 + ... + 958.

It is an arithmetic number, because the mean of its divisors is an integer number (31240).

2²³¹²¹¹ is an apocalyptic number.

231211 is a deficient number, since it is larger than the sum of its proper divisors (18709).

231211 is a wasteful number, since it uses less digits than its factorization.

231211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its digits is 12, while the sum is 10.

The square root of 231211 is about 480.8440495628. The cubic root of 231211 is about 61.3766005614.

Adding to 231211 its reverse (112132), we get a palindrome (343343).

It can be divided in two parts, 2 and 31211, that added together give a palindrome (31213).

The spelling of 231211 in words is "two hundred thirty-one thousand, two hundred eleven".