18131353 has 4 divisors (see below), whose sum is σ = 18473508. Its totient is φ = 17789200.

The previous prime is 18131303. The next prime is 18131359. The reversal of 18131353 is 35313181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11916304 + 6215049 = 3452^2 + 2493^2 .

It is a cyclic number.

It is not a de Polignac number, because 18131353 - 2²¹ = 16034201 is a prime.

It is a super-2 number, since 2×18131353² = 657491923221218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18131359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170998 + ... + 171103.

It is an arithmetic number, because the mean of its divisors is an integer number (4618377).

Almost surely, 2^18131353 is an apocalyptic number.

It is an amenable number.

18131353 is a deficient number, since it is larger than the sum of its proper divisors (342155).

18131353 is an equidigital number, since it uses as much as digits as its factorization.

18131353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342154.

The product of its digits is 1080, while the sum is 25.

The square root of 18131353 is about 4258.0926481231. The cubic root of 18131353 is about 262.7100806545.

The spelling of 18131353 in words is "eighteen million, one hundred thirty-one thousand, three hundred fifty-three".