491163263 has 4 divisors (see below), whose sum is σ = 491216520. Its totient is φ = 491110008.

The previous prime is 491163241. The next prime is 491163289. The reversal of 491163263 is 362361194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491163263 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 (491163203) 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, 8828 + ... + 32561.

It is an arithmetic number, because the mean of its divisors is an integer number (122804130).

Almost surely, 2^491163263 is an apocalyptic number.

491163263 is a deficient number, since it is larger than the sum of its proper divisors (53257).

491163263 is a wasteful number, since it uses less digits than its factorization.

491163263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53256.

The product of its digits is 23328, while the sum is 35.

The square root of 491163263 is about 22162.2034779938. The cubic root of 491163263 is about 788.9968911234.

The spelling of 491163263 in words is "four hundred ninety-one million, one hundred sixty-three thousand, two hundred sixty-three".