231000311 has 2 divisors, whose sum is σ = 231000312. Its totient is φ = 231000310.

The previous prime is 231000307. The next prime is 231000317. The reversal of 231000311 is 113000132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231000311 - 2² = 231000307 is a prime.

It is a super-2 number, since 2×231000311² = 106722287364193442, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231000292 and 231000301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231000317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115500155 + 115500156.

It is an arithmetic number, because the mean of its divisors is an integer number (115500156).

Almost surely, 2^231000311 is an apocalyptic number.

231000311 is a deficient number, since it is larger than the sum of its proper divisors (1).

231000311 is an equidigital number, since it uses as much as digits as its factorization.

231000311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 231000311 is about 15198.6943847161. The cubic root of 231000311 is about 613.5795193241.

Adding to 231000311 its reverse (113000132), we get a palindrome (344000443).

The spelling of 231000311 in words is "two hundred thirty-one million, three hundred eleven", and thus it is an aban number.