1818273921191 has 32 divisors (see below), whose sum is σ = 2260380057600. Its totient is φ = 1424171548800.

The previous prime is 1818273921173. The next prime is 1818273921253. The reversal of 1818273921191 is 1911293728181.

It is not a de Polignac number, because 1818273921191 - 2¹⁰ = 1818273920167 is a prime.

It is a super-2 number, since 2×1818273921191² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818273921091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86743370 + ... + 86764328.

It is an arithmetic number, because the mean of its divisors is an integer number (70636876800).

Almost surely, 2^{1818273921191} is an apocalyptic number.

1818273921191 is a deficient number, since it is larger than the sum of its proper divisors (442106136409).

1818273921191 is a wasteful number, since it uses less digits than its factorization.

1818273921191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30519.

The product of its digits is 435456, while the sum is 53.

The spelling of 1818273921191 in words is "one trillion, eight hundred eighteen billion, two hundred seventy-three million, nine hundred twenty-one thousand, one hundred ninety-one".