1818603121 has 8 divisors (see below), whose sum is σ = 1824076800. Its totient is φ = 1813138080.

The previous prime is 1818603097. The next prime is 1818603167. The reversal of 1818603121 is 1213068181.

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 1818603121 - 2¹⁵ = 1818570353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818403121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811120 + ... + 813358.

It is an arithmetic number, because the mean of its divisors is an integer number (228009600).

Almost surely, 2^1818603121 is an apocalyptic number.

It is an amenable number.

1818603121 is a deficient number, since it is larger than the sum of its proper divisors (5473679).

1818603121 is a wasteful number, since it uses less digits than its factorization.

1818603121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1818603121 is about 42645.0831984181. The cubic root of 1818603121 is about 1220.6167089398.

The spelling of 1818603121 in words is "one billion, eight hundred eighteen million, six hundred three thousand, one hundred twenty-one".