231000811 has 4 divisors (see below), whose sum is σ = 244589112. Its totient is φ = 217412512.

The previous prime is 231000787. The next prime is 231000853. The reversal of 231000811 is 118000132.

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 231000811 - 2⁵ = 231000779 is a prime.

It is a super-2 number, since 2×231000811² = 106722749365315442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231000311) 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, 6794125 + ... + 6794158.

It is an arithmetic number, because the mean of its divisors is an integer number (61147278).

Almost surely, 2^231000811 is an apocalyptic number.

231000811 is a deficient number, since it is larger than the sum of its proper divisors (13588301).

231000811 is a wasteful number, since it uses less digits than its factorization.

231000811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13588300.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 231000811 is about 15198.7108334885. The cubic root of 231000811 is about 613.5799620213.

Adding to 231000811 its reverse (118000132), we get a palindrome (349000943).

The spelling of 231000811 in words is "two hundred thirty-one million, eight hundred eleven", and thus it is an aban number.