231155020305 has 48 divisors (see below), whose sum is σ = 437901572160. Its totient is φ = 111867868800.

The previous prime is 231155020303. The next prime is 231155020309. The reversal of 231155020305 is 503020551132.

It is a happy number.

231155020305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231155020305 - 2¹ = 231155020303 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231155020303) 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 47 ways as a sum of consecutive naturals, for example, 163795 + ... + 699384.

It is an arithmetic number, because the mean of its divisors is an integer number (9122949420).

Almost surely, 2^231155020305 is an apocalyptic number.

It is an amenable number.

231155020305 is a deficient number, since it is larger than the sum of its proper divisors (206746551855).

231155020305 is a wasteful number, since it uses less digits than its factorization.

231155020305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863742 (or 863739 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 231155020305 its reverse (503020551132), we get a palindrome (734175571437).

The spelling of 231155020305 in words is "two hundred thirty-one billion, one hundred fifty-five million, twenty thousand, three hundred five".