3931091 has 8 divisors (see below), whose sum is σ = 4164864. Its totient is φ = 3702600.

The previous prime is 3931087. The next prime is 3931093. The reversal of 3931091 is 1901393.

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 3931091 - 2² = 3931087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3931091.

It is not an unprimeable number, because it can be changed into a prime (3931093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 2816.

It is an arithmetic number, because the mean of its divisors is an integer number (520608).

Almost surely, 2^3931091 is an apocalyptic number.

3931091 is a deficient number, since it is larger than the sum of its proper divisors (233773).

3931091 is a wasteful number, since it uses less digits than its factorization.

3931091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 3931091 is about 1982.6979094154. The cubic root of 3931091 is about 157.8232681800.

The spelling of 3931091 in words is "three million, nine hundred thirty-one thousand, ninety-one".