890611009 has 2 divisors, whose sum is σ = 890611010. Its totient is φ = 890611008.

The previous prime is 890610953. The next prime is 890611013. The reversal of 890611009 is 900116098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462121009 + 428490000 = 21497^2 + 20700^2 .

It is a cyclic number.

It is not a de Polignac number, because 890611009 - 2¹⁹ = 890086721 is a prime.

It is not a weakly prime, because it can be changed into another prime (890611019) 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, 445305504 + 445305505.

It is an arithmetic number, because the mean of its divisors is an integer number (445305505).

Almost surely, 2^890611009 is an apocalyptic number.

It is an amenable number.

890611009 is a deficient number, since it is larger than the sum of its proper divisors (1).

890611009 is an equidigital number, since it uses as much as digits as its factorization.

890611009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 890611009 is about 29843.1065574615. The cubic root of 890611009 is about 962.1202447222.

The spelling of 890611009 in words is "eight hundred ninety million, six hundred eleven thousand, nine".