491717679 has 16 divisors (see below), whose sum is σ = 675542112. Its totient is φ = 317910528.

The previous prime is 491717659. The next prime is 491717693. The reversal of 491717679 is 976717194.

It is not a de Polignac number, because 491717679 - 2⁹ = 491717167 is a prime.

It is a super-2 number, since 2×491717679² = 483572551682294082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491717609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27667 + ... + 41819.

It is an arithmetic number, because the mean of its divisors is an integer number (42221382).

Almost surely, 2^491717679 is an apocalyptic number.

491717679 is a deficient number, since it is larger than the sum of its proper divisors (183824433).

491717679 is a wasteful number, since it uses less digits than its factorization.

491717679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14506.

The product of its digits is 666792, while the sum is 51.

The square root of 491717679 is about 22174.7080927799. The cubic root of 491717679 is about 789.2936478558.

The spelling of 491717679 in words is "four hundred ninety-one million, seven hundred seventeen thousand, six hundred seventy-nine".