18145601 has 4 divisors (see below), whose sum is σ = 18155604. Its totient is φ = 18135600.

The previous prime is 18145529. The next prime is 18145637. The reversal of 18145601 is 10654181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6250000 + 11895601 = 2500^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 18145601 - 2¹⁴ = 18129217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18145661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (4538901).

Almost surely, 2^18145601 is an apocalyptic number.

It is an amenable number.

18145601 is a deficient number, since it is larger than the sum of its proper divisors (10003).

18145601 is an equidigital number, since it uses as much as digits as its factorization.

18145601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18145601 is about 4259.7653691254. The cubic root of 18145601 is about 262.7788770131.

Adding to 18145601 its reverse (10654181), we get a palindrome (28799782).

The spelling of 18145601 in words is "eighteen million, one hundred forty-five thousand, six hundred one".