3691281 has 8 divisors (see below), whose sum is σ = 5369184. Its totient is φ = 2237120.

The previous prime is 3691277. The next prime is 3691283. The reversal of 3691281 is 1821963.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3691281 - 2² = 3691277 is a prime.

It is a super-2 number, since 2×3691281² = 27251110841922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3691283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55896 + ... + 55961.

It is an arithmetic number, because the mean of its divisors is an integer number (671148).

Almost surely, 2^3691281 is an apocalyptic number.

It is an amenable number.

3691281 is a deficient number, since it is larger than the sum of its proper divisors (1677903).

3691281 is a wasteful number, since it uses less digits than its factorization.

3691281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111871.

The product of its digits is 2592, while the sum is 30.

The square root of 3691281 is about 1921.2706732785. The cubic root of 3691281 is about 154.5464507747.

The spelling of 3691281 in words is "three million, six hundred ninety-one thousand, two hundred eighty-one".