18100505 has 8 divisors (see below), whose sum is σ = 21834312. Its totient is φ = 14404608.

The previous prime is 18100501. The next prime is 18100541. The reversal of 18100505 is 50500181.

It can be written as a sum of positive squares in 4 ways, for example, as 994009 + 17106496 = 997^2 + 4136^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18100505 - 2² = 18100501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18100501) 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, 8414 + ... + 10343.

It is an arithmetic number, because the mean of its divisors is an integer number (2729289).

Almost surely, 2^18100505 is an apocalyptic number.

It is an amenable number.

18100505 is a deficient number, since it is larger than the sum of its proper divisors (3733807).

18100505 is a wasteful number, since it uses less digits than its factorization.

18100505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18955.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 18100505 is about 4254.4688270100. The cubic root of 18100505 is about 262.5610077399.

Adding to 18100505 its reverse (50500181), we get a palindrome (68600686).

The spelling of 18100505 in words is "eighteen million, one hundred thousand, five hundred five".