231433505 has 16 divisors (see below), whose sum is σ = 280962000. Its totient is φ = 182999040.

The previous prime is 231433493. The next prime is 231433513. The reversal of 231433505 is 505334132.

231433505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 28561 + 231404944 = 169^2 + 15212^2 .

It is not a de Polignac number, because 231433505 - 2⁸ = 231433249 is a prime.

It is a super-2 number, since 2×231433505² = 107122934473170050, which contains 22 as substring.

It is a nialpdrome in base 16.

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, 178901 + ... + 180189.

It is an arithmetic number, because the mean of its divisors is an integer number (17560125).

Almost surely, 2^231433505 is an apocalyptic number.

It is an amenable number.

231433505 is a deficient number, since it is larger than the sum of its proper divisors (49528495).

231433505 is a wasteful number, since it uses less digits than its factorization.

231433505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 231433505 is about 15212.9387364835. The cubic root of 231433505 is about 613.9628275939.

Adding to 231433505 its reverse (505334132), we get a palindrome (736767637).

The spelling of 231433505 in words is "two hundred thirty-one million, four hundred thirty-three thousand, five hundred five".