1031989 has 6 divisors (see below), whose sum is σ = 1200534. Its totient is φ = 884520.

The previous prime is 1031981. The next prime is 1031999. The reversal of 1031989 is 9891301.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 1764 = 1015^2 + 42^2 .

It is not a de Polignac number, because 1031989 - 2³ = 1031981 is a prime.

It is a super-2 number, since 2×1031989² = 2130002592242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1031989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10482 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (200089).

2^1031989 is an apocalyptic number.

It is an amenable number.

1031989 is a deficient number, since it is larger than the sum of its proper divisors (168545).

1031989 is an equidigital number, since it uses as much as digits as its factorization.

1031989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21075 (or 21068 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1031989 is about 1015.8685938644. The cubic root of 1031989 is about 101.0551278956.

The spelling of 1031989 in words is "one million, thirty-one thousand, nine hundred eighty-nine".