20031131101 has 2 divisors, whose sum is σ = 20031131102. Its totient is φ = 20031131100.

The previous prime is 20031131041. The next prime is 20031131117. The reversal of 20031131101 is 10113113002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11804822500 + 8226308601 = 108650^2 + 90699^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031131101 - 2¹⁵ = 20031098333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031131191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015565550 + 10015565551.

It is an arithmetic number, because the mean of its divisors is an integer number (10015565551).

Almost surely, 2^20031131101 is an apocalyptic number.

It is an amenable number.

20031131101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031131101 is an equidigital number, since it uses as much as digits as its factorization.

20031131101 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20031131101 its reverse (10113113002), we get a palindrome (30144244103).

The spelling of 20031131101 in words is "twenty billion, thirty-one million, one hundred thirty-one thousand, one hundred one".