491963359 has 4 divisors (see below), whose sum is σ = 505259704. Its totient is φ = 478667016.

The previous prime is 491963347. The next prime is 491963377. The reversal of 491963359 is 953369194.

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 491963359 - 2²¹ = 489866207 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 (491963159) 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, 6648117 + ... + 6648190.

It is an arithmetic number, because the mean of its divisors is an integer number (126314926).

Almost surely, 2^491963359 is an apocalyptic number.

491963359 is a deficient number, since it is larger than the sum of its proper divisors (13296345).

491963359 is a wasteful number, since it uses less digits than its factorization.

491963359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13296344.

The product of its digits is 787320, while the sum is 49.

The square root of 491963359 is about 22180.2470455133. The cubic root of 491963359 is about 789.4250792206.

The spelling of 491963359 in words is "four hundred ninety-one million, nine hundred sixty-three thousand, three hundred fifty-nine".