1000021849 has 2 divisors, whose sum is σ = 1000021850. Its totient is φ = 1000021848.

The previous prime is 1000021843. The next prime is 1000021879. The reversal of 1000021849 is 9481200001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981255625 + 18766224 = 31325^2 + 4332^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000021849 - 2¹⁷ = 999890777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000021843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010924 + 500010925.

It is an arithmetic number, because the mean of its divisors is an integer number (500010925).

Almost surely, 2^1000021849 is an apocalyptic number.

It is an amenable number.

1000021849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000021849 is an equidigital number, since it uses as much as digits as its factorization.

1000021849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1000021849 is about 31623.1220628198. The cubic root of 1000021849 is about 1000.0072829470.

The spelling of 1000021849 in words is "one billion, twenty-one thousand, eight hundred forty-nine".