405531231 has 32 divisors (see below), whose sum is σ = 652124160. Its totient is φ = 218979936.

The previous prime is 405531229. The next prime is 405531263. The reversal of 405531231 is 132135504.

It is not a de Polignac number, because 405531231 - 2¹ = 405531229 is a prime.

It is a super-2 number, since 2×405531231² = 328911158632750722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405531221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193270 + ... + 195356.

It is an arithmetic number, because the mean of its divisors is an integer number (20378880).

Almost surely, 2^405531231 is an apocalyptic number.

405531231 is a deficient number, since it is larger than the sum of its proper divisors (246592929).

405531231 is a wasteful number, since it uses less digits than its factorization.

405531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 405531231 is about 20137.8060125725. The cubic root of 405531231 is about 740.1869694349.

Adding to 405531231 its reverse (132135504), we get a palindrome (537666735).

The spelling of 405531231 in words is "four hundred five million, five hundred thirty-one thousand, two hundred thirty-one".