3103981 has 2 divisors, whose sum is σ = 3103982. Its totient is φ = 3103980.

The previous prime is 3103949. The next prime is 3104063. The reversal of 3103981 is 1893013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3031081 + 72900 = 1741^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 3103981 - 2⁵ = 3103949 is a prime.

It is a super-2 number, since 2×3103981² = 19269396096722, which contains 22 as substring.

3103981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3103381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1551990 + 1551991.

It is an arithmetic number, because the mean of its divisors is an integer number (1551991).

Almost surely, 2^3103981 is an apocalyptic number.

It is an amenable number.

3103981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3103981 is an equidigital number, since it uses as much as digits as its factorization.

3103981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 3103981 is about 1761.8118514756. The cubic root of 3103981 is about 145.8723629594.

Adding to 3103981 its reverse (1893013), we get a palindrome (4996994).

The spelling of 3103981 in words is "three million, one hundred three thousand, nine hundred eighty-one".