491275902763 has 4 divisors (see below), whose sum is σ = 493233177528. Its totient is φ = 489318628000.

The previous prime is 491275902709. The next prime is 491275902773. The reversal of 491275902763 is 367209572194.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491275902763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491275902773) 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, 978637006 + ... + 978637507.

It is an arithmetic number, because the mean of its divisors is an integer number (123308294382).

Almost surely, 2^491275902763 is an apocalyptic number.

491275902763 is a deficient number, since it is larger than the sum of its proper divisors (1957274765).

491275902763 is a wasteful number, since it uses less digits than its factorization.

491275902763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957274764.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 491275902763 in words is "four hundred ninety-one billion, two hundred seventy-five million, nine hundred two thousand, seven hundred sixty-three".