1813255161 has 8 divisors (see below), whose sum is σ = 2417883264. Its totient is φ = 1208731920.

The previous prime is 1813255111. The next prime is 1813255183. The reversal of 1813255161 is 1615523181.

It is a happy number.

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

It is not a de Polignac number, because 1813255161 - 2⁶ = 1813255097 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1813255111) 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, 33696 + ... + 69006.

It is an arithmetic number, because the mean of its divisors is an integer number (302235408).

Almost surely, 2^1813255161 is an apocalyptic number.

It is an amenable number.

1813255161 is a deficient number, since it is larger than the sum of its proper divisors (604628103).

1813255161 is a wasteful number, since it uses less digits than its factorization.

1813255161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52431.

The product of its digits is 7200, while the sum is 33.

The square root of 1813255161 is about 42582.3339073846. Note that the first 3 decimals coincide. The cubic root of 1813255161 is about 1219.4190463854.

The spelling of 1813255161 in words is "one billion, eight hundred thirteen million, two hundred fifty-five thousand, one hundred sixty-one".