231406211 has 2 divisors, whose sum is σ = 231406212. Its totient is φ = 231406210.

The previous prime is 231406199. The next prime is 231406213. The reversal of 231406211 is 112604132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231406211 - 2²⁶ = 164297347 is a prime.

Together with 231406213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231406213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115703105 + 115703106.

It is an arithmetic number, because the mean of its divisors is an integer number (115703106).

Almost surely, 2^231406211 is an apocalyptic number.

231406211 is a deficient number, since it is larger than the sum of its proper divisors (1).

231406211 is an equidigital number, since it uses as much as digits as its factorization.

231406211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 231406211 is about 15212.0416446971. The cubic root of 231406211 is about 613.9386908407.

The spelling of 231406211 in words is "two hundred thirty-one million, four hundred six thousand, two hundred eleven".