2104381 has 2 divisors, whose sum is σ = 2104382. Its totient is φ = 2104380.

The previous prime is 2104363. The next prime is 2104391. The reversal of 2104381 is 1834012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 116281 = 1410^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104381 - 2¹⁵ = 2071613 is a prime.

It is a super-2 number, since 2×2104381² = 8856838786322, which contains 22 as substring.

2104381 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2104391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052190 + 1052191.

It is an arithmetic number, because the mean of its divisors is an integer number (1052191).

2^2104381 is an apocalyptic number.

It is an amenable number.

2104381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2104381 is an equidigital number, since it uses as much as digits as its factorization.

2104381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2104381 is about 1450.6484756825. The cubic root of 2104381 is about 128.1469057132.

Adding to 2104381 its reverse (1834012), we get a palindrome (3938393).

It can be divided in two parts, 2104 and 381, that added together give a triangular number (2485 = T₇₀).

The spelling of 2104381 in words is "two million, one hundred four thousand, three hundred eighty-one".