1000651 has 2 divisors, whose sum is σ = 1000652. Its totient is φ = 1000650.

The previous prime is 1000639. The next prime is 1000667. The reversal of 1000651 is 1560001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000651 - 2⁵ = 1000619 is a prime.

1000651 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1000621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500325 + 500326.

It is an arithmetic number, because the mean of its divisors is an integer number (500326).

2^1000651 is an apocalyptic number.

1000651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000651 is an equidigital number, since it uses as much as digits as its factorization.

1000651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1000651 is about 1000.3254470421. The cubic root of 1000651 is about 100.0216952928.

Adding to 1000651 its reverse (1560001), we get a palindrome (2560652).

The spelling of 1000651 in words is "one million, six hundred fifty-one", and thus it is an aban number.