999047209 has 2 divisors, whose sum is σ = 999047210. Its totient is φ = 999047208.

The previous prime is 999047183. The next prime is 999047213. The reversal of 999047209 is 902740999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703310400 + 295736809 = 26520^2 + 17197^2 .

It is a cyclic number.

It is not a de Polignac number, because 999047209 - 2¹⁵ = 999014441 is a prime.

It is not a weakly prime, because it can be changed into another prime (999047219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499523604 + 499523605.

It is an arithmetic number, because the mean of its divisors is an integer number (499523605).

Almost surely, 2^999047209 is an apocalyptic number.

It is an amenable number.

999047209 is a deficient number, since it is larger than the sum of its proper divisors (1).

999047209 is an equidigital number, since it uses as much as digits as its factorization.

999047209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 999047209 is about 31607.7080630659. The cubic root of 999047209 is about 999.6823020787.

The spelling of 999047209 in words is "nine hundred ninety-nine million, forty-seven thousand, two hundred nine".