491698563 has 8 divisors (see below), whose sum is σ = 658319376. Its totient is φ = 326438400.

The previous prime is 491698541. The next prime is 491698579. The reversal of 491698563 is 365896194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491698563 - 2²⁴ = 474921347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491698523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339318 + ... + 340763.

It is an arithmetic number, because the mean of its divisors is an integer number (82289922).

Almost surely, 2^491698563 is an apocalyptic number.

491698563 is a deficient number, since it is larger than the sum of its proper divisors (166620813).

491698563 is a wasteful number, since it uses less digits than its factorization.

491698563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680325.

The product of its digits is 1399680, while the sum is 51.

The square root of 491698563 is about 22174.2770569865. The cubic root of 491698563 is about 789.2834195388.

The spelling of 491698563 in words is "four hundred ninety-one million, six hundred ninety-eight thousand, five hundred sixty-three".