20131311001 has 6 divisors (see below), whose sum is σ = 20204326590. Its totient is φ = 20058558336.

The previous prime is 20131310987. The next prime is 20131311007. The reversal of 20131311001 is 10011313102.

It can be written as a sum of positive squares in 3 ways, for example, as 3036010000 + 17095301001 = 55100^2 + 130749^2 .

It is not a de Polignac number, because 20131311001 - 2¹³ = 20131302809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131311007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54456 + ... + 207913.

It is an arithmetic number, because the mean of its divisors is an integer number (3367387765).

Almost surely, 2^20131311001 is an apocalyptic number.

It is an amenable number.

20131311001 is a deficient number, since it is larger than the sum of its proper divisors (73015589).

20131311001 is an frugal number, since it uses more digits than its factorization.

20131311001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262923 (or 262646 counting only the distinct ones).

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

Adding to 20131311001 its reverse (10011313102), we get a palindrome (30142624103).

The spelling of 20131311001 in words is "twenty billion, one hundred thirty-one million, three hundred eleven thousand, one".