231628811 has 4 divisors (see below), whose sum is σ = 231676824. Its totient is φ = 231580800.

The previous prime is 231628801. The next prime is 231628841. The reversal of 231628811 is 118826132.

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 231628811 - 2¹⁰ = 231627787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231628801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15845 + ... + 26726.

It is an arithmetic number, because the mean of its divisors is an integer number (57919206).

Almost surely, 2^231628811 is an apocalyptic number.

231628811 is a deficient number, since it is larger than the sum of its proper divisors (48013).

231628811 is an equidigital number, since it uses as much as digits as its factorization.

231628811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48012.

The product of its digits is 4608, while the sum is 32.

The square root of 231628811 is about 15219.3564581424. The cubic root of 231628811 is about 614.1354861279.

The spelling of 231628811 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, eight hundred eleven".