231311221153 has 4 divisors (see below), whose sum is σ = 231312199300. Its totient is φ = 231310243008.

The previous prime is 231311221151. The next prime is 231311221177. The reversal of 231311221153 is 351122113132.

231311221153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 101233421584 + 130077799569 = 318172^2 + 360663^2 .

It is a cyclic number.

It is not a de Polignac number, because 231311221153 - 2¹ = 231311221151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311221151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 111373 + ... + 689221.

It is an arithmetic number, because the mean of its divisors is an integer number (57828049825).

Almost surely, 2^231311221153 is an apocalyptic number.

It is an amenable number.

231311221153 is a deficient number, since it is larger than the sum of its proper divisors (978147).

231311221153 is an equidigital number, since it uses as much as digits as its factorization.

231311221153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978146.

The product of its digits is 1080, while the sum is 25.

Adding to 231311221153 its reverse (351122113132), we get a palindrome (582433334285).

The spelling of 231311221153 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred twenty-one thousand, one hundred fifty-three".