1089591 has 8 divisors (see below), whose sum is σ = 1459584. Its totient is φ = 723000.

The previous prime is 1089563. The next prime is 1089611. The reversal of 1089591 is 1959801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1089591 - 2⁷ = 1089463 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (182448).

2^1089591 is an apocalyptic number.

1089591 is a deficient number, since it is larger than the sum of its proper divisors (369993).

1089591 is a wasteful number, since it uses less digits than its factorization.

1089591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1089591 is about 1043.8347570377. The cubic root of 1089591 is about 102.9013728979.

The spelling of 1089591 in words is "one million, eighty-nine thousand, five hundred ninety-one".