1103989 has 2 divisors, whose sum is σ = 1103990. Its totient is φ = 1103988.

The previous prime is 1103987. The next prime is 1104017. The reversal of 1103989 is 9893011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 18225 = 1042^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103989 - 2¹ = 1103987 is a prime.

Together with 1103987, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1103989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1103981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551994 + 551995.

It is an arithmetic number, because the mean of its divisors is an integer number (551995).

2^1103989 is an apocalyptic number.

It is an amenable number.

1103989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103989 is an equidigital number, since it uses as much as digits as its factorization.

1103989 is an evil number, because the sum of its binary digits is even.

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

The square root of 1103989 is about 1050.7088083765. The cubic root of 1103989 is about 103.3526417844.

The spelling of 1103989 in words is "one million, one hundred three thousand, nine hundred eighty-nine".