231322505 has 4 divisors (see below), whose sum is σ = 277587012. Its totient is φ = 185058000.

The previous prime is 231322493. The next prime is 231322517. The reversal of 231322505 is 505223132.

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

It is an interprime number because it is at equal distance from previous prime (231322493) and next prime (231322517).

It can be written as a sum of positive squares in 2 ways, for example, as 127057984 + 104264521 = 11272^2 + 10211^2 .

It is not a de Polignac number, because 231322505 - 2⁴ = 231322489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23132246 + ... + 23132255.

It is an arithmetic number, because the mean of its divisors is an integer number (69396753).

Almost surely, 2^231322505 is an apocalyptic number.

It is an amenable number.

231322505 is a deficient number, since it is larger than the sum of its proper divisors (46264507).

231322505 is an equidigital number, since it uses as much as digits as its factorization.

231322505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46264506.

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

The square root of 231322505 is about 15209.2900886268. The cubic root of 231322505 is about 613.8646557352.

Adding to 231322505 its reverse (505223132), we get a palindrome (736545637).

The spelling of 231322505 in words is "two hundred thirty-one million, three hundred twenty-two thousand, five hundred five".