3391981 has 4 divisors (see below), whose sum is σ = 3403132. Its totient is φ = 3380832.

The previous prime is 3391967. The next prime is 3391987. The reversal of 3391981 is 1891933.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259081 + 3132900 = 509^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 3391981 - 2⁷ = 3391853 is a prime.

It is a super-2 number, since 2×3391981² = 23011070208722, 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 (3391987) 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 in 3 ways as a sum of consecutive naturals, for example, 5106 + ... + 5731.

It is an arithmetic number, because the mean of its divisors is an integer number (850783).

Almost surely, 2^3391981 is an apocalyptic number.

It is an amenable number.

3391981 is a deficient number, since it is larger than the sum of its proper divisors (11151).

3391981 is a wasteful number, since it uses less digits than its factorization.

3391981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11150.

The product of its digits is 5832, while the sum is 34.

The square root of 3391981 is about 1841.7331511378. The cubic root of 3391981 is about 150.2511496281.

The spelling of 3391981 in words is "three million, three hundred ninety-one thousand, nine hundred eighty-one".