231103505 has 4 divisors (see below), whose sum is σ = 277324212. Its totient is φ = 184882800.

The previous prime is 231103501. The next prime is 231103547. The reversal of 231103505 is 505301132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115584001 + 115519504 = 10751^2 + 10748^2 .

It is not a de Polignac number, because 231103505 - 2² = 231103501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231103501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23110346 + ... + 23110355.

It is an arithmetic number, because the mean of its divisors is an integer number (69331053).

Almost surely, 2^231103505 is an apocalyptic number.

It is an amenable number.

231103505 is a deficient number, since it is larger than the sum of its proper divisors (46220707).

231103505 is an equidigital number, since it uses as much as digits as its factorization.

231103505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46220706.

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

The square root of 231103505 is about 15202.0888367356. The cubic root of 231103505 is about 613.6708731675.

Adding to 231103505 its reverse (505301132), we get a palindrome (736404637).

The spelling of 231103505 in words is "two hundred thirty-one million, one hundred three thousand, five hundred five".