999850009 has 2 divisors, whose sum is σ = 999850010. Its totient is φ = 999850008.

The previous prime is 999849979. The next prime is 999850013. The reversal of 999850009 is 900058999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 878233225 + 121616784 = 29635^2 + 11028^2 .

It is a cyclic number.

It is not a de Polignac number, because 999850009 - 2⁹ = 999849497 is a prime.

It is not a weakly prime, because it can be changed into another prime (999859009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499925004 + 499925005.

It is an arithmetic number, because the mean of its divisors is an integer number (499925005).

Almost surely, 2^999850009 is an apocalyptic number.

It is an amenable number.

999850009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999850009 is an equidigital number, since it uses as much as digits as its factorization.

999850009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 999850009 is about 31620.4049468061. The cubic root of 999850009 is about 999.9500005001.

The spelling of 999850009 in words is "nine hundred ninety-nine million, eight hundred fifty thousand, nine".