491638735 has 16 divisors (see below), whose sum is σ = 674726976. Its totient is φ = 336883968.

The previous prime is 491638733. The next prime is 491638751. The reversal of 491638735 is 537836194.

It is a cyclic number.

It is not a de Polignac number, because 491638735 - 2¹ = 491638733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491638733) 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, 55107 + ... + 63403.

It is an arithmetic number, because the mean of its divisors is an integer number (42170436).

Almost surely, 2^491638735 is an apocalyptic number.

491638735 is a deficient number, since it is larger than the sum of its proper divisors (183088241).

491638735 is a wasteful number, since it uses less digits than its factorization.

491638735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002.

The product of its digits is 544320, while the sum is 46.

The square root of 491638735 is about 22172.9279753487. The cubic root of 491638735 is about 789.2514059114.

The spelling of 491638735 in words is "four hundred ninety-one million, six hundred thirty-eight thousand, seven hundred thirty-five".