3331981 has 2 divisors, whose sum is σ = 3331982. Its totient is φ = 3331980.

The previous prime is 3331963. The next prime is 3331997. The reversal of 3331981 is 1891333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 1602756 = 1315^2 + 1266^2 .

It is an emirp because it is prime and its reverse (1891333) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3331981 - 2¹¹ = 3329933 is a prime.

It is a super-2 number, since 2×3331981² = 22204194768722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3331921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665990 + 1665991.

It is an arithmetic number, because the mean of its divisors is an integer number (1665991).

Almost surely, 2^3331981 is an apocalyptic number.

It is an amenable number.

3331981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3331981 is an equidigital number, since it uses as much as digits as its factorization.

3331981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 3331981 is about 1825.3714690440. The cubic root of 3331981 is about 149.3599543094.

The spelling of 3331981 in words is "three million, three hundred thirty-one thousand, nine hundred eighty-one".