1813813933 has 4 divisors (see below), whose sum is σ = 1815931260. Its totient is φ = 1811696608.

The previous prime is 1813813927. The next prime is 1813813943. The reversal of 1813813933 is 3393183181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3393183181 = 34519 ⋅98299.

It can be written as a sum of positive squares in 2 ways, for example, as 1574740489 + 239073444 = 39683^2 + 15462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813813933 - 2⁵ = 1813813901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813813943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057378 + ... + 1059091.

It is an arithmetic number, because the mean of its divisors is an integer number (453982815).

Almost surely, 2^1813813933 is an apocalyptic number.

It is an amenable number.

1813813933 is a deficient number, since it is larger than the sum of its proper divisors (2117327).

1813813933 is an equidigital number, since it uses as much as digits as its factorization.

1813813933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117326.

The product of its digits is 46656, while the sum is 40.

The square root of 1813813933 is about 42588.8944796645. The cubic root of 1813813933 is about 1219.5442920863.

The spelling of 1813813933 in words is "one billion, eight hundred thirteen million, eight hundred thirteen thousand, nine hundred thirty-three".