491904763 has 4 divisors (see below), whose sum is σ = 562176880. Its totient is φ = 421632648.

The previous prime is 491904761. The next prime is 491904769. The reversal of 491904763 is 367409194.

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

It is a cyclic number.

It is not a de Polignac number, because 491904763 - 2¹ = 491904761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491904761) 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, 35136048 + ... + 35136061.

It is an arithmetic number, because the mean of its divisors is an integer number (140544220).

Almost surely, 2^491904763 is an apocalyptic number.

491904763 is a deficient number, since it is larger than the sum of its proper divisors (70272117).

491904763 is an equidigital number, since it uses as much as digits as its factorization.

491904763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70272116.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 491904763 is about 22178.9261011439. The cubic root of 491904763 is about 789.3937361082.

The spelling of 491904763 in words is "four hundred ninety-one million, nine hundred four thousand, seven hundred sixty-three".