1000691 has 2 divisors, whose sum is σ = 1000692. Its totient is φ = 1000690.

The previous prime is 1000679. The next prime is 1000697. The reversal of 1000691 is 1960001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000691 - 2¹⁰ = 999667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500345 + 500346.

It is an arithmetic number, because the mean of its divisors is an integer number (500346).

2^1000691 is an apocalyptic number.

1000691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000691 is an equidigital number, since it uses as much as digits as its factorization.

1000691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1000691 is about 1000.3454403355. The cubic root of 1000691 is about 100.0230280300.

Adding to 1000691 its reverse (1960001), we get a palindrome (2960692).

The spelling of 1000691 in words is "one million, six hundred ninety-one", and thus it is an aban number.