1806349111 has 4 divisors (see below), whose sum is σ = 2064398992. Its totient is φ = 1548299232.

The previous prime is 1806349109. The next prime is 1806349121. The reversal of 1806349111 is 1119436081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1119436081 = 4337 ⋅258113.

It is a cyclic number.

It is not a de Polignac number, because 1806349111 - 2¹ = 1806349109 is a prime.

It is a super-2 number, since 2×1806349111² = 6525794221620980642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806349121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129024930 + ... + 129024943.

It is an arithmetic number, because the mean of its divisors is an integer number (516099748).

Almost surely, 2^1806349111 is an apocalyptic number.

1806349111 is a deficient number, since it is larger than the sum of its proper divisors (258049881).

1806349111 is an equidigital number, since it uses as much as digits as its factorization.

1806349111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258049880.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1806349111 is about 42501.1659957700. The cubic root of 1806349111 is about 1217.8689643178.

The spelling of 1806349111 in words is "one billion, eight hundred six million, three hundred forty-nine thousand, one hundred eleven".