2103031981 has 2 divisors, whose sum is σ = 2103031982. Its totient is φ = 2103031980.

The previous prime is 2103031927. The next prime is 2103032021. The reversal of 2103031981 is 1891303012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1287015625 + 816016356 = 35875^2 + 28566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2103031981 is a prime.

It is a super-2 number, since 2×2103031981² = 8845487026217568722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2103931981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051515990 + 1051515991.

It is an arithmetic number, because the mean of its divisors is an integer number (1051515991).

Almost surely, 2^2103031981 is an apocalyptic number.

It is an amenable number.

2103031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103031981 is an equidigital number, since it uses as much as digits as its factorization.

2103031981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2103031981 is about 45858.8266422071. The cubic root of 2103031981 is about 1281.1951688897.

Adding to 2103031981 its reverse (1891303012), we get a palindrome (3994334993).

It can be divided in two parts, 2103031 and 981, that added together give a palindrome (2104012).

The spelling of 2103031981 in words is "two billion, one hundred three million, thirty-one thousand, nine hundred eighty-one".