1058821 has 2 divisors, whose sum is σ = 1058822. Its totient is φ = 1058820.

The previous prime is 1058809. The next prime is 1058839. The reversal of 1058821 is 1288501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 30625 = 1014^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1058821 - 2⁷ = 1058693 is a prime.

It is a super-2 number, since 2×1058821² = 2242203820082, which contains 22 as substring.

1058821 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1058861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529410 + 529411.

It is an arithmetic number, because the mean of its divisors is an integer number (529411).

2^1058821 is an apocalyptic number.

It is an amenable number.

1058821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1058821 is an equidigital number, since it uses as much as digits as its factorization.

1058821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1058821 is about 1028.9902817811. The cubic root of 1058821 is about 101.9234655917.

It can be divided in two parts, 10588 and 21, that added together give a square (10609 = 103²).

The spelling of 1058821 in words is "one million, fifty-eight thousand, eight hundred twenty-one".