1811218494 has 8 divisors (see below), whose sum is σ = 3622437000. Its totient is φ = 603739496.

The previous prime is 1811218477. The next prime is 1811218531. The reversal of 1811218494 is 4948121181.

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

1811218494 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150934869 + ... + 150934880.

It is an arithmetic number, because the mean of its divisors is an integer number (452804625).

Almost surely, 2^1811218494 is an apocalyptic number.

1811218494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1811218494 is a wasteful number, since it uses less digits than its factorization.

1811218494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301869754.

The product of its digits is 18432, while the sum is 39.

The square root of 1811218494 is about 42558.4127288601. The cubic root of 1811218494 is about 1218.9623206370.

The spelling of 1811218494 in words is "one billion, eight hundred eleven million, two hundred eighteen thousand, four hundred ninety-four".