1231111101113 has 4 divisors (see below), whose sum is σ = 1231230393588. Its totient is φ = 1230991808640.

The previous prime is 1231111101029. The next prime is 1231111101131. The reversal of 1231111101113 is 3111011111321.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 734983865344 + 496127235769 = 857312^2 + 704363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231111101113 - 2¹⁴ = 1231111084729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231111101091 and 1231111101100.

It is not an unprimeable number, because it can be changed into a prime (1231110101113) 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, 59630756 + ... + 59651397.

It is an arithmetic number, because the mean of its divisors is an integer number (307807598397).

Almost surely, 2^{1231111101113} is an apocalyptic number.

It is an amenable number.

1231111101113 is a deficient number, since it is larger than the sum of its proper divisors (119292475).

1231111101113 is a wasteful number, since it uses less digits than its factorization.

1231111101113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119292474.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 1231111101113 its reverse (3111011111321), we get a palindrome (4342122212434).

The spelling of 1231111101113 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, one hundred one thousand, one hundred thirteen".