1091004 has 12 divisors (see below), whose sum is σ = 2545704. Its totient is φ = 363664.

The previous prime is 1091003. The next prime is 1091017. The reversal of 1091004 is 4001901.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45447 + ... + 45470.

It is an arithmetic number, because the mean of its divisors is an integer number (212142).

2^1091004 is an apocalyptic number.

It is an amenable number.

1091004 is an abundant number, since it is smaller than the sum of its proper divisors (1454700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091004 is a wasteful number, since it uses less digits than its factorization.

1091004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90924 (or 90922 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1091004 is about 1044.5113690142. The cubic root of 1091004 is about 102.9458350961.

Adding to 1091004 its reverse (4001901), we get a palindrome (5092905).

The spelling of 1091004 in words is "one million, ninety-one thousand, four".