1006691 has 4 divisors (see below), whose sum is σ = 1150512. Its totient is φ = 862872.

The previous prime is 1006651. The next prime is 1006711. The reversal of 1006691 is 1966001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1966001 = 283 ⋅6947.

It is a cyclic number.

It is not a de Polignac number, because 1006691 - 2¹⁴ = 990307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1006651) 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, 71900 + ... + 71913.

It is an arithmetic number, because the mean of its divisors is an integer number (287628).

2^1006691 is an apocalyptic number.

1006691 is a deficient number, since it is larger than the sum of its proper divisors (143821).

1006691 is an equidigital number, since it uses as much as digits as its factorization.

1006691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143820.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1006691 is about 1003.3399224590. The cubic root of 1006691 is about 100.2225377355. Note that the first 3 decimals are identical.

The spelling of 1006691 in words is "one million, six thousand, six hundred ninety-one".