499578109 has 2 divisors, whose sum is σ = 499578110. Its totient is φ = 499578108.

The previous prime is 499578103. The next prime is 499578137. The reversal of 499578109 is 901875994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492973209 + 6604900 = 22203^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 499578109 - 2²¹ = 497480957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499578103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249789054 + 249789055.

It is an arithmetic number, because the mean of its divisors is an integer number (249789055).

Almost surely, 2^499578109 is an apocalyptic number.

It is an amenable number.

499578109 is a deficient number, since it is larger than the sum of its proper divisors (1).

499578109 is an equidigital number, since it uses as much as digits as its factorization.

499578109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 499578109 is about 22351.2440145957. The cubic root of 499578109 is about 793.4772264279.

The spelling of 499578109 in words is "four hundred ninety-nine million, five hundred seventy-eight thousand, one hundred nine".