999817249 has 2 divisors, whose sum is σ = 999817250. Its totient is φ = 999817248.

The previous prime is 999817241. The next prime is 999817289. The reversal of 999817249 is 942718999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598536225 + 401281024 = 24465^2 + 20032^2 .

It is a cyclic number.

It is not a de Polignac number, because 999817249 - 2³ = 999817241 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999817193 and 999817202.

It is not a weakly prime, because it can be changed into another prime (999817241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499908624 + 499908625.

It is an arithmetic number, because the mean of its divisors is an integer number (499908625).

Almost surely, 2^999817249 is an apocalyptic number.

It is an amenable number.

999817249 is a deficient number, since it is larger than the sum of its proper divisors (1).

999817249 is an equidigital number, since it uses as much as digits as its factorization.

999817249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 999817249 is about 31619.8869226315. The cubic root of 999817249 is about 999.9390792887.

The spelling of 999817249 in words is "nine hundred ninety-nine million, eight hundred seventeen thousand, two hundred forty-nine".