2081901 has 4 divisors (see below), whose sum is σ = 2775872. Its totient is φ = 1387932.

The previous prime is 2081897. The next prime is 2081903. The reversal of 2081901 is 1091802.

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 not a de Polignac number, because 2081901 - 2² = 2081897 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081903) 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, 346981 + ... + 346986.

It is an arithmetic number, because the mean of its divisors is an integer number (693968).

2^2081901 is an apocalyptic number.

It is an amenable number.

2081901 is a deficient number, since it is larger than the sum of its proper divisors (693971).

2081901 is an equidigital number, since it uses as much as digits as its factorization.

2081901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693970.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 2081901 is about 1442.8794128409. The cubic root of 2081901 is about 127.6889624074.

Subtracting from 2081901 its reverse (1091802), we obtain a palindrome (990099).

The spelling of 2081901 in words is "two million, eighty-one thousand, nine hundred one".