1806005161 has 4 divisors (see below), whose sum is σ = 1864263424. Its totient is φ = 1747746900.

The previous prime is 1806005111. The next prime is 1806005207. The reversal of 1806005161 is 1615006081.

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 1806005161 - 2¹¹ = 1806003113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806005111) 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, 29129085 + ... + 29129146.

It is an arithmetic number, because the mean of its divisors is an integer number (466065856).

Almost surely, 2^1806005161 is an apocalyptic number.

It is an amenable number.

1806005161 is a deficient number, since it is larger than the sum of its proper divisors (58258263).

1806005161 is an equidigital number, since it uses as much as digits as its factorization.

1806005161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58258262.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1806005161 is about 42497.1194435576. The cubic root of 1806005161 is about 1217.7916605789.

It can be divided in two parts, 180600 and 5161, that added together give a square (185761 = 431²).

The spelling of 1806005161 in words is "one billion, eight hundred six million, five thousand, one hundred sixty-one".