491656603 has 4 divisors (see below), whose sum is σ = 493026480. Its totient is φ = 490286728.

The previous prime is 491656591. The next prime is 491656619. The reversal of 491656603 is 306656194.

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 491656603 - 2⁹ = 491656091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491656663) 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, 684400 + ... + 685117.

It is an arithmetic number, because the mean of its divisors is an integer number (123256620).

Almost surely, 2^491656603 is an apocalyptic number.

491656603 is a deficient number, since it is larger than the sum of its proper divisors (1369877).

491656603 is a wasteful number, since it uses less digits than its factorization.

491656603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369876.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 491656603 is about 22173.3308954699. The cubic root of 491656603 is about 789.2609672500.

The spelling of 491656603 in words is "four hundred ninety-one million, six hundred fifty-six thousand, six hundred three".