498971809 has 4 divisors (see below), whose sum is σ = 570253504. Its totient is φ = 427690116.

The previous prime is 498971801. The next prime is 498971819. The reversal of 498971809 is 908179894.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908179894 = 2 ⋅454089947.

It is not a de Polignac number, because 498971809 - 2³ = 498971801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 498971809.

It is not an unprimeable number, because it can be changed into a prime (498971801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35640837 + ... + 35640850.

It is an arithmetic number, because the mean of its divisors is an integer number (142563376).

Almost surely, 2^498971809 is an apocalyptic number.

It is an amenable number.

498971809 is a deficient number, since it is larger than the sum of its proper divisors (71281695).

498971809 is an equidigital number, since it uses as much as digits as its factorization.

498971809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71281694.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 498971809 is about 22337.6768935357. The cubic root of 498971809 is about 793.1561021406.

The spelling of 498971809 in words is "four hundred ninety-eight million, nine hundred seventy-one thousand, eight hundred nine".