20131111013 has 4 divisors (see below), whose sum is σ = 21679658028. Its totient is φ = 18582564000.

The previous prime is 20131111003. The next prime is 20131111027. The reversal of 20131111013 is 31011113102.

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: 31011113102 = 2 ⋅15505556551.

It can be written as a sum of positive squares in 2 ways, for example, as 8515229284 + 11615881729 = 92278^2 + 107777^2 .

It is not a de Polignac number, because 20131111013 - 2¹⁶ = 20131045477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131111003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774273488 + ... + 774273513.

It is an arithmetic number, because the mean of its divisors is an integer number (5419914507).

Almost surely, 2^20131111013 is an apocalyptic number.

It is an amenable number.

20131111013 is a deficient number, since it is larger than the sum of its proper divisors (1548547015).

20131111013 is a wasteful number, since it uses less digits than its factorization.

20131111013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548547014.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 20131111013 its reverse (31011113102), we get a palindrome (51142224115).

The spelling of 20131111013 in words is "twenty billion, one hundred thirty-one million, one hundred eleven thousand, thirteen".