1001231113 has 4 divisors (see below), whose sum is σ = 1001541780. Its totient is φ = 1000920448.

The previous prime is 1001231089. The next prime is 1001231117. The reversal of 1001231113 is 3111321001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3111321001 = 149 ⋅20881349.

It can be written as a sum of positive squares in 2 ways, for example, as 931958784 + 69272329 = 30528^2 + 8323^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001231113 - 2¹³ = 1001222921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001231093 and 1001231102.

It is not an unprimeable number, because it can be changed into a prime (1001231117) 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, 150448 + ... + 156961.

It is an arithmetic number, because the mean of its divisors is an integer number (250385445).

Almost surely, 2^1001231113 is an apocalyptic number.

It is an amenable number.

1001231113 is a deficient number, since it is larger than the sum of its proper divisors (310667).

1001231113 is an equidigital number, since it uses as much as digits as its factorization.

1001231113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310666.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1001231113 is about 31642.2362199640. The cubic root of 1001231113 is about 1000.4102027107.

Adding to 1001231113 its reverse (3111321001), we get a palindrome (4112552114).

The spelling of 1001231113 in words is "one billion, one million, two hundred thirty-one thousand, one hundred thirteen".