990841 has 2 divisors, whose sum is σ = 990842. Its totient is φ = 990840.

The previous prime is 990809. The next prime is 990851. The reversal of 990841 is 148099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 958441 + 32400 = 979^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 990841 - 2⁵ = 990809 is a prime.

It is equal to p₇₇₈₃₆ and since 990841 and 77836 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (990851) 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 as a sum of consecutive naturals, namely, 495420 + 495421.

It is an arithmetic number, because the mean of its divisors is an integer number (495421).

2⁹⁹⁰⁸⁴¹ is an apocalyptic number.

It is an amenable number.

990841 is a deficient number, since it is larger than the sum of its proper divisors (1).

990841 is an equidigital number, since it uses as much as digits as its factorization.

990841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 990841 is about 995.4099657930. The cubic root of 990841 is about 99.6937631472.

The spelling of 990841 in words is "nine hundred ninety thousand, eight hundred forty-one".