231130505 has 16 divisors (see below), whose sum is σ = 281280384. Its totient is φ = 182307840.

The previous prime is 231130499. The next prime is 231130511. The reversal of 231130505 is 505031132.

231130505 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 (231130499) and next prime (231130511).

It is not a de Polignac number, because 231130505 - 2⁶ = 231130441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108329 + ... + 110441.

It is an arithmetic number, because the mean of its divisors is an integer number (17580024).

Almost surely, 2^231130505 is an apocalyptic number.

It is an amenable number.

231130505 is a deficient number, since it is larger than the sum of its proper divisors (50149879).

231130505 is a wasteful number, since it uses less digits than its factorization.

231130505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 231130505 is about 15202.9768466574. The cubic root of 231130505 is about 613.6947707834.

Adding to 231130505 its reverse (505031132), we get a palindrome (736161637).

The spelling of 231130505 in words is "two hundred thirty-one million, one hundred thirty thousand, five hundred five".