1231001013111 has 4 divisors (see below), whose sum is σ = 1641334684152. Its totient is φ = 820667342072.

The previous prime is 1231001013059. The next prime is 1231001013127. The reversal of 1231001013111 is 1113101001321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231001013111 - 2¹⁷ = 1231000882039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001013191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205166835516 + ... + 205166835521.

It is an arithmetic number, because the mean of its divisors is an integer number (410333671038).

Almost surely, 2^{1231001013111} is an apocalyptic number.

1231001013111 is a deficient number, since it is larger than the sum of its proper divisors (410333671041).

1231001013111 is an equidigital number, since it uses as much as digits as its factorization.

1231001013111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410333671040.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 1231001013111 its reverse (1113101001321), we get a palindrome (2344102014432).

The spelling of 1231001013111 in words is "one trillion, two hundred thirty-one billion, one million, thirteen thousand, one hundred eleven".