1091671 has 6 divisors (see below), whose sum is σ = 1269960. Its totient is φ = 935676.

The previous prime is 1091663. The next prime is 1091681. The reversal of 1091671 is 1761901.

It is not a de Polignac number, because 1091671 - 2³ = 1091663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11091 + ... + 11188.

It is an arithmetic number, because the mean of its divisors is an integer number (211660).

2^1091671 is an apocalyptic number.

1091671 is a deficient number, since it is larger than the sum of its proper divisors (178289).

1091671 is an equidigital number, since it uses as much as digits as its factorization.

1091671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22293 (or 22286 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1091671 is about 1044.8306082806. The cubic root of 1091671 is about 102.9668099302.

The spelling of 1091671 in words is "one million, ninety-one thousand, six hundred seventy-one".