104781821 has 2 divisors, whose sum is σ = 104781822. Its totient is φ = 104781820.

The previous prime is 104781811. The next prime is 104781839. The reversal of 104781821 is 128187401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93799225 + 10982596 = 9685^2 + 3314^2 .

It is a cyclic number.

It is not a de Polignac number, because 104781821 - 2¹⁸ = 104519677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104781811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52390910 + 52390911.

It is an arithmetic number, because the mean of its divisors is an integer number (52390911).

Almost surely, 2^104781821 is an apocalyptic number.

It is an amenable number.

104781821 is a deficient number, since it is larger than the sum of its proper divisors (1).

104781821 is an equidigital number, since it uses as much as digits as its factorization.

104781821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 104781821 is about 10236.2991847640. The cubic root of 104781821 is about 471.4424089821.

The spelling of 104781821 in words is "one hundred four million, seven hundred eighty-one thousand, eight hundred twenty-one".