1808020361 has 4 divisors (see below), whose sum is σ = 2066308992. Its totient is φ = 1549731732.

The previous prime is 1808020351. The next prime is 1808020369. The reversal of 1808020361 is 1630208081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1808020361 - 2¹⁸ = 1807758217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1808020369) 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, 129144305 + ... + 129144318.

It is an arithmetic number, because the mean of its divisors is an integer number (516577248).

Almost surely, 2^1808020361 is an apocalyptic number.

It is an amenable number.

1808020361 is a deficient number, since it is larger than the sum of its proper divisors (258288631).

1808020361 is an equidigital number, since it uses as much as digits as its factorization.

1808020361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258288630.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1808020361 is about 42520.8226754845. The cubic root of 1808020361 is about 1218.2444428829.

The spelling of 1808020361 in words is "one billion, eight hundred eight million, twenty thousand, three hundred sixty-one".