18219101 has 8 divisors (see below), whose sum is σ = 18516600. Its totient is φ = 17923840.

The previous prime is 18219083. The next prime is 18219107. The reversal of 18219101 is 10191281.

It can be written as a sum of positive squares in 4 ways, for example, as 2805625 + 15413476 = 1675^2 + 3926^2 .

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 18219101 - 2⁶ = 18219037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18219107) 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, 23561 + ... + 24321.

It is an arithmetic number, because the mean of its divisors is an integer number (2314575).

Almost surely, 2^18219101 is an apocalyptic number.

It is an amenable number.

18219101 is a deficient number, since it is larger than the sum of its proper divisors (297499).

18219101 is an equidigital number, since it uses as much as digits as its factorization.

18219101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 18219101 is about 4268.3838862033. The cubic root of 18219101 is about 263.1332003207.

The spelling of 18219101 in words is "eighteen million, two hundred nineteen thousand, one hundred one".