231820317 has 12 divisors (see below), whose sum is σ = 335453664. Its totient is φ = 154269000.

The previous prime is 231820307. The next prime is 231820327. The reversal of 231820317 is 713028132.

231820317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231820307) and next prime (231820327).

It is not a de Polignac number, because 231820317 - 2⁷ = 231820189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231820307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17809 + ... + 27942.

It is an arithmetic number, because the mean of its divisors is an integer number (27954472).

Almost surely, 2^231820317 is an apocalyptic number.

It is an amenable number.

231820317 is a deficient number, since it is larger than the sum of its proper divisors (103633347).

231820317 is a wasteful number, since it uses less digits than its factorization.

231820317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46320 (or 46317 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 231820317 is about 15225.6466857733. The cubic root of 231820317 is about 614.3046910901.

Adding to 231820317 its reverse (713028132), we get a palindrome (944848449).

The spelling of 231820317 in words is "two hundred thirty-one million, eight hundred twenty thousand, three hundred seventeen".