1816379161 has 27 divisors (see below), whose sum is σ = 2035724061. Its totient is φ = 1620203904.

The previous prime is 1816379153. The next prime is 1816379177. The reversal of 1816379161 is 1619736181.

The square root of 1816379161 is 42619.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 414326025 + 1402053136 = 20355^2 + 37444^2 .

It is not a de Polignac number, because 1816379161 - 2³ = 1816379153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816379141) 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 26 ways as a sum of consecutive naturals, for example, 16663975 + ... + 16664083.

Almost surely, 2^1816379161 is an apocalyptic number.

1816379161 is the 42619-th square number.

1816379161 is the 21310-th centered octagonal number.

It is an amenable number.

1816379161 is a deficient number, since it is larger than the sum of its proper divisors (219344900).

1816379161 is an equidigital number, since it uses as much as digits as its factorization.

1816379161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 149 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The cubic root of 1816379161 is about 1220.1189441050.

The spelling of 1816379161 in words is "one billion, eight hundred sixteen million, three hundred seventy-nine thousand, one hundred sixty-one".