1091667 has 4 divisors (see below), whose sum is σ = 1455560. Its totient is φ = 727776.

The previous prime is 1091663. The next prime is 1091681. The reversal of 1091667 is 7661901.

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

It is not a de Polignac number, because 1091667 - 2² = 1091663 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091663) 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, 181942 + ... + 181947.

It is an arithmetic number, because the mean of its divisors is an integer number (363890).

2^1091667 is an apocalyptic number.

1091667 is a deficient number, since it is larger than the sum of its proper divisors (363893).

1091667 is an equidigital number, since it uses as much as digits as its factorization.

1091667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363892.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1091667 is about 1044.8286940930. The cubic root of 1091667 is about 102.9666841695.

The spelling of 1091667 in words is "one million, ninety-one thousand, six hundred sixty-seven".