1812101 has 4 divisors (see below), whose sum is σ = 1890912. Its totient is φ = 1733292.

The previous prime is 1812091. The next prime is 1812103. The reversal of 1812101 is 1012181.

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 1812101 - 2⁶ = 1812037 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39371 + ... + 39416.

It is an arithmetic number, because the mean of its divisors is an integer number (472728).

2^1812101 is an apocalyptic number.

It is an amenable number.

1812101 is a deficient number, since it is larger than the sum of its proper divisors (78811).

1812101 is an equidigital number, since it uses as much as digits as its factorization.

1812101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78810.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1812101 is about 1346.1430087476. The cubic root of 1812101 is about 121.9160265997.

Adding to 1812101 its reverse (1012181), we get a palindrome (2824282).

The spelling of 1812101 in words is "one million, eight hundred twelve thousand, one hundred one".