231405530 has 32 divisors (see below), whose sum is σ = 460214784. Its totient is φ = 83328256.

The previous prime is 231405527. The next prime is 231405563. The reversal of 231405530 is 35504132.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 231405496 and 231405505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25682 + ... + 33501.

It is an arithmetic number, because the mean of its divisors is an integer number (14381712).

Almost surely, 2^231405530 is an apocalyptic number.

231405530 is a deficient number, since it is larger than the sum of its proper divisors (228809254).

231405530 is a wasteful number, since it uses less digits than its factorization.

231405530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59230.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 231405530 is about 15212.0192610975. The cubic root of 231405530 is about 613.9380885914.

Adding to 231405530 its reverse (35504132), we get a palindrome (266909662).

The spelling of 231405530 in words is "two hundred thirty-one million, four hundred five thousand, five hundred thirty".