3681691 has 4 divisors (see below), whose sum is σ = 3964912. Its totient is φ = 3398472.

The previous prime is 3681683. The next prime is 3681697. The reversal of 3681691 is 1961863.

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

It is a cyclic number.

It is not a de Polignac number, because 3681691 - 2³ = 3681683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681697) 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, 141591 + ... + 141616.

It is an arithmetic number, because the mean of its divisors is an integer number (991228).

Almost surely, 2^3681691 is an apocalyptic number.

3681691 is a deficient number, since it is larger than the sum of its proper divisors (283221).

3681691 is a wasteful number, since it uses less digits than its factorization.

3681691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283220.

The product of its digits is 7776, while the sum is 34.

The square root of 3681691 is about 1918.7733060474. The cubic root of 3681691 is about 154.4124967513.

The spelling of 3681691 in words is "three million, six hundred eighty-one thousand, six hundred ninety-one".