109531321 has 4 divisors (see below), whose sum is σ = 110762100. Its totient is φ = 108300544.

The previous prime is 109531249. The next prime is 109531349. The reversal of 109531321 is 123135901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123135901 = 7 ⋅17590843.

It can be written as a sum of positive squares in 2 ways, for example, as 73770921 + 35760400 = 8589^2 + 5980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109531321 is a prime.

It is a super-2 number, since 2×109531321² = 23994220560010082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109531351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615256 + ... + 615433.

It is an arithmetic number, because the mean of its divisors is an integer number (27690525).

Almost surely, 2^109531321 is an apocalyptic number.

It is an amenable number.

109531321 is a deficient number, since it is larger than the sum of its proper divisors (1230779).

109531321 is an equidigital number, since it uses as much as digits as its factorization.

109531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230778.

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

The square root of 109531321 is about 10465.7212364939. The cubic root of 109531321 is about 478.4605206210.

The spelling of 109531321 in words is "one hundred nine million, five hundred thirty-one thousand, three hundred twenty-one".