490918807789 has 4 divisors (see below), whose sum is σ = 495979826524. Its totient is φ = 485857789056.

The previous prime is 490918807739. The next prime is 490918807811. The reversal of 490918807789 is 987708819094.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 311771473225 + 179147334564 = 558365^2 + 423258^2 .

It is a cyclic number.

It is not a de Polignac number, because 490918807789 - 2¹⁵ = 490918775021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490918807739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2530509222 + ... + 2530509415.

It is an arithmetic number, because the mean of its divisors is an integer number (123994956631).

Almost surely, 2^490918807789 is an apocalyptic number.

It is an amenable number.

490918807789 is a deficient number, since it is larger than the sum of its proper divisors (5061018735).

490918807789 is an equidigital number, since it uses as much as digits as its factorization.

490918807789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061018734.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 490918807789 in words is "four hundred ninety billion, nine hundred eighteen million, eight hundred seven thousand, seven hundred eighty-nine".