491813658 has 48 divisors (see below), whose sum is σ = 1219335936. Its totient is φ = 140343840.

The previous prime is 491813633. The next prime is 491813681. The reversal of 491813658 is 856318194.

491813658 is a `hidden beast` number, since 491 + 81 + 36 + 58 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126735 + ... + 130557.

It is an arithmetic number, because the mean of its divisors is an integer number (25402832).

Almost surely, 2^491813658 is an apocalyptic number.

491813658 is an abundant number, since it is smaller than the sum of its proper divisors (727522278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491813658 is a wasteful number, since it uses less digits than its factorization.

491813658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4859 (or 4856 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 491813658 is about 22176.8721419410. The cubic root of 491813658 is about 789.3449989256.

It can be divided in two parts, 4918136 and 58, that added together give a palindrome (4918194).

The spelling of 491813658 in words is "four hundred ninety-one million, eight hundred thirteen thousand, six hundred fifty-eight".