3691081 has 4 divisors (see below), whose sum is σ = 3701200. Its totient is φ = 3680964.

The previous prime is 3691043. The next prime is 3691087. The reversal of 3691081 is 1801963.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1801963 = 373 ⋅4831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3691081 is a prime.

It is a super-2 number, since 2×3691081² = 27248157897122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3691087) 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, 4491 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (925300).

Almost surely, 2^3691081 is an apocalyptic number.

It is an amenable number.

3691081 is a deficient number, since it is larger than the sum of its proper divisors (10119).

3691081 is an equidigital number, since it uses as much as digits as its factorization.

3691081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10118.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 3691081 is about 1921.2186236865. The cubic root of 3691081 is about 154.5436595262.

The spelling of 3691081 in words is "three million, six hundred ninety-one thousand, eighty-one".