231912311 has 2 divisors, whose sum is σ = 231912312. Its totient is φ = 231912310.

The previous prime is 231912299. The next prime is 231912323. The reversal of 231912311 is 113219132.

It is a balanced prime because it is at equal distance from previous prime (231912299) and next prime (231912323).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231912311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231912371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115956155 + 115956156.

It is an arithmetic number, because the mean of its divisors is an integer number (115956156).

Almost surely, 2^231912311 is an apocalyptic number.

231912311 is a deficient number, since it is larger than the sum of its proper divisors (1).

231912311 is an equidigital number, since it uses as much as digits as its factorization.

231912311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 231912311 is about 15228.6674072290. The cubic root of 231912311 is about 614.3859391774.

The spelling of 231912311 in words is "two hundred thirty-one million, nine hundred twelve thousand, three hundred eleven".