3281981 has 2 divisors, whose sum is σ = 3281982. Its totient is φ = 3281980.

The previous prime is 3281933. The next prime is 3281987. The reversal of 3281981 is 1891823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2859481 + 422500 = 1691^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 3281981 - 2¹⁰ = 3280957 is a prime.

It is a super-2 number, since 2×3281981² = 21542798568722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3281987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640990 + 1640991.

It is an arithmetic number, because the mean of its divisors is an integer number (1640991).

Almost surely, 2^3281981 is an apocalyptic number.

It is an amenable number.

3281981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3281981 is an equidigital number, since it uses as much as digits as its factorization.

3281981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 3281981 is about 1811.6238572066. The cubic root of 3281981 is about 148.6090829380.

The spelling of 3281981 in words is "three million, two hundred eighty-one thousand, nine hundred eighty-one".