998753209 has 2 divisors, whose sum is σ = 998753210. Its totient is φ = 998753208.

The previous prime is 998753167. The next prime is 998753227. The reversal of 998753209 is 902357899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998749609 + 3600 = 31603^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 998753209 - 2⁹ = 998752697 is a prime.

It is not a weakly prime, because it can be changed into another prime (998753269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499376604 + 499376605.

It is an arithmetic number, because the mean of its divisors is an integer number (499376605).

Almost surely, 2^998753209 is an apocalyptic number.

It is an amenable number.

998753209 is a deficient number, since it is larger than the sum of its proper divisors (1).

998753209 is an equidigital number, since it uses as much as digits as its factorization.

998753209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 998753209 is about 31603.0569565667. The cubic root of 998753209 is about 999.5842301594.

The spelling of 998753209 in words is "nine hundred ninety-eight million, seven hundred fifty-three thousand, two hundred nine".