1808101 has 4 divisors (see below), whose sum is σ = 1837804. Its totient is φ = 1778400.

The previous prime is 1808089. The next prime is 1808117. The reversal of 1808101 is 1018081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1018081 = 1009².

It can be written as a sum of positive squares in 2 ways, for example, as 857476 + 950625 = 926^2 + 975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1808101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14760 + ... + 14881.

It is an arithmetic number, because the mean of its divisors is an integer number (459451).

2^1808101 is an apocalyptic number.

It is an amenable number.

1808101 is a deficient number, since it is larger than the sum of its proper divisors (29703).

1808101 is an equidigital number, since it uses as much as digits as its factorization.

1808101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29702.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1808101 is about 1344.6564617031. The cubic root of 1808101 is about 121.8262554138.

It can be divided in two parts, 180 and 8101, that added together give a square (8281 = 91²).

The spelling of 1808101 in words is "one million, eight hundred eight thousand, one hundred one".