3391681 has 4 divisors (see below), whose sum is σ = 3425364. Its totient is φ = 3358000.

The previous prime is 3391673. The next prime is 3391693. The reversal of 3391681 is 1861933.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1861933 = 41 ⋅45413.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 1915456 = 1215^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 3391681 - 2³ = 3391673 is a prime.

It is a super-2 number, since 2×3391681² = 23007000011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3391601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16690 + ... + 16891.

It is an arithmetic number, because the mean of its divisors is an integer number (856341).

Almost surely, 2^3391681 is an apocalyptic number.

It is an amenable number.

3391681 is a deficient number, since it is larger than the sum of its proper divisors (33683).

3391681 is a wasteful number, since it uses less digits than its factorization.

3391681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33682.

The product of its digits is 3888, while the sum is 31.

The square root of 3391681 is about 1841.6517043133. The cubic root of 3391681 is about 150.2467198987.

The spelling of 3391681 in words is "three million, three hundred ninety-one thousand, six hundred eighty-one".