1109391 has 8 divisors (see below), whose sum is σ = 1557120. Its totient is φ = 700632.

The previous prime is 1109387. The next prime is 1109393. The reversal of 1109391 is 1939011.

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

It is not a de Polignac number, because 1109391 - 2² = 1109387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109393) 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, 9675 + ... + 9788.

It is an arithmetic number, because the mean of its divisors is an integer number (194640).

2^1109391 is an apocalyptic number.

1109391 is a deficient number, since it is larger than the sum of its proper divisors (447729).

1109391 is a wasteful number, since it uses less digits than its factorization.

1109391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19485.

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 1109391 is about 1053.2763170223. The cubic root of 1109391 is about 103.5209414089.

The spelling of 1109391 in words is "one million, one hundred nine thousand, three hundred ninety-one".