3011981 has 6 divisors (see below), whose sum is σ = 3503790. Its totient is φ = 2581656.

The previous prime is 3011971. The next prime is 3011989. The reversal of 3011981 is 1891103.

It can be written as a sum of positive squares in only one way, i.e., 2941225 + 70756 = 1715^2 + 266^2 .

It is not a de Polignac number, because 3011981 - 2⁶ = 3011917 is a prime.

It is a super-2 number, since 2×3011981² = 18144059088722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3011989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30686 + ... + 30783.

It is an arithmetic number, because the mean of its divisors is an integer number (583965).

Almost surely, 2^3011981 is an apocalyptic number.

It is an amenable number.

3011981 is a deficient number, since it is larger than the sum of its proper divisors (491809).

3011981 is an equidigital number, since it uses as much as digits as its factorization.

3011981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61483 (or 61476 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 3011981 is about 1735.5059780940. The cubic root of 3011981 is about 144.4166974755.

The spelling of 3011981 in words is "three million, eleven thousand, nine hundred eighty-one".