1091365 has 8 divisors (see below), whose sum is σ = 1428768. Its totient is φ = 793680.

The previous prime is 1091359. The next prime is 1091369. The reversal of 1091365 is 5631901.

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

It is not a de Polignac number, because 1091365 - 2¹⁵ = 1058597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091369) 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, 9867 + ... + 9976.

It is an arithmetic number, because the mean of its divisors is an integer number (178596).

2^1091365 is an apocalyptic number.

It is an amenable number.

1091365 is a deficient number, since it is larger than the sum of its proper divisors (337403).

1091365 is a wasteful number, since it uses less digits than its factorization.

1091365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1091365 is about 1044.6841627975. The cubic root of 1091365 is about 102.9571883537.

It can be divided in two parts, 109 and 1365, that multiplied together give a triangular number (148785 = T₅₄₅).

The spelling of 1091365 in words is "one million, ninety-one thousand, three hundred sixty-five".