231900805 has 4 divisors (see below), whose sum is σ = 278280972. Its totient is φ = 185520640.

The previous prime is 231900749. The next prime is 231900827. The reversal of 231900805 is 508009132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52099524 + 179801281 = 7218^2 + 13409^2 .

It is not a de Polignac number, because 231900805 - 2¹⁹ = 231376517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 23190076 + ... + 23190085.

It is an arithmetic number, because the mean of its divisors is an integer number (69570243).

Almost surely, 2^231900805 is an apocalyptic number.

It is an amenable number.

231900805 is a deficient number, since it is larger than the sum of its proper divisors (46380167).

231900805 is an equidigital number, since it uses as much as digits as its factorization.

231900805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46380166.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 231900805 is about 15228.2896281887. The cubic root of 231900805 is about 614.3757783807.

Adding to 231900805 its reverse (508009132), we get a palindrome (739909937).

The spelling of 231900805 in words is "two hundred thirty-one million, nine hundred thousand, eight hundred five".