1016989 has 4 divisors (see below), whose sum is σ = 1021660. Its totient is φ = 1012320.

The previous prime is 1016971. The next prime is 1017007. The reversal of 1016989 is 9896101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9896101 = 67 ⋅147703.

It is an interprime number because it is at equal distance from previous prime (1016971) and next prime (1017007).

It can be written as a sum of positive squares in 2 ways, for example, as 708964 + 308025 = 842^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016989 - 2¹¹ = 1014941 is a prime.

It is a super-2 number, since 2×1016989² = 2068533252242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016909) 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 in 3 ways as a sum of consecutive naturals, for example, 1992 + ... + 2449.

It is an arithmetic number, because the mean of its divisors is an integer number (255415).

2^1016989 is an apocalyptic number.

It is an amenable number.

1016989 is a deficient number, since it is larger than the sum of its proper divisors (4671).

1016989 is an equidigital number, since it uses as much as digits as its factorization.

1016989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1016989 is about 1008.4587249858. The cubic root of 1016989 is about 100.5631229728.

Subtracting from 1016989 its product of nonzero digits (3888), we obtain a palindrome (1013101).

The spelling of 1016989 in words is "one million, sixteen thousand, nine hundred eighty-nine".