231105061331 has 4 divisors (see below), whose sum is σ = 231284075064. Its totient is φ = 230926047600.

The previous prime is 231105061309. The next prime is 231105061337. The reversal of 231105061331 is 133160501132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231105061331 is a prime.

It is a super-2 number, since 2×231105061331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231105061331.

It is not an unprimeable number, because it can be changed into a prime (231105061337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89504930 + ... + 89507511.

It is an arithmetic number, because the mean of its divisors is an integer number (57821018766).

Almost surely, 2^231105061331 is an apocalyptic number.

231105061331 is a deficient number, since it is larger than the sum of its proper divisors (179013733).

231105061331 is a wasteful number, since it uses less digits than its factorization.

231105061331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179013732.

The product of its (nonzero) digits is 1620, while the sum is 26.

Adding to 231105061331 its reverse (133160501132), we get a palindrome (364265562463).

The spelling of 231105061331 in words is "two hundred thirty-one billion, one hundred five million, sixty-one thousand, three hundred thirty-one".