491635855 has 8 divisors (see below), whose sum is σ = 590082192. Its totient is φ = 393229248.

The previous prime is 491635853. The next prime is 491635957. The reversal of 491635855 is 558536194.

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

It is a cyclic number.

It is not a de Polignac number, because 491635855 - 2¹ = 491635853 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 (491635853) 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, 41787 + ... + 52243.

It is an arithmetic number, because the mean of its divisors is an integer number (73760274).

Almost surely, 2^491635855 is an apocalyptic number.

491635855 is a deficient number, since it is larger than the sum of its proper divisors (98446337).

491635855 is a wasteful number, since it uses less digits than its factorization.

491635855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19865.

The product of its digits is 648000, while the sum is 46.

The square root of 491635855 is about 22172.8630311920. The cubic root of 491635855 is about 789.2498647740.

The spelling of 491635855 in words is "four hundred ninety-one million, six hundred thirty-five thousand, eight hundred fifty-five".