1165321 has 4 divisors (see below), whose sum is σ = 1202944. Its totient is φ = 1127700.

The previous prime is 1165303. The next prime is 1165349. The reversal of 1165321 is 1235611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1165321 - 2⁷ = 1165193 is a prime.

It is the 1080-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165301) by changing a digit.

It is a nontrivial repunit in base 1079.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18765 + ... + 18826.

It is an arithmetic number, because the mean of its divisors is an integer number (300736).

2^1165321 is an apocalyptic number.

It is an amenable number.

1165321 is a deficient number, since it is larger than the sum of its proper divisors (37623).

1165321 is an equidigital number, since it uses as much as digits as its factorization.

1165321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37622.

The product of its digits is 180, while the sum is 19.

The square root of 1165321 is about 1079.5003473830. The cubic root of 1165321 is about 105.2321695581.

The spelling of 1165321 in words is "one million, one hundred sixty-five thousand, three hundred twenty-one".