1001331113 has 4 divisors (see below), whose sum is σ = 1001650260. Its totient is φ = 1001011968.

The previous prime is 1001331109. The next prime is 1001331131. The reversal of 1001331113 is 3111331001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3111331001 = 2953 ⋅1053617.

It can be written as a sum of positive squares in 2 ways, for example, as 510398464 + 490932649 = 22592^2 + 22157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001331113 - 2² = 1001331109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001331313) 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, 154820 + ... + 161157.

It is an arithmetic number, because the mean of its divisors is an integer number (250412565).

Almost surely, 2^1001331113 is an apocalyptic number.

It is an amenable number.

1001331113 is a deficient number, since it is larger than the sum of its proper divisors (319147).

1001331113 is an equidigital number, since it uses as much as digits as its factorization.

1001331113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319146.

The product of its (nonzero) digits is 27, while the sum is 14.

The square root of 1001331113 is about 31643.8163469579. The cubic root of 1001331113 is about 1000.4435076053.

Adding to 1001331113 its reverse (3111331001), we get a palindrome (4112662114).

The spelling of 1001331113 in words is "one billion, one million, three hundred thirty-one thousand, one hundred thirteen".