491145818 has 24 divisors (see below), whose sum is σ = 777792288. Its totient is φ = 232563672.

The previous prime is 491145773. The next prime is 491145833. The reversal of 491145818 is 818541194.

It is a super-3 number, since 3×491145818³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106721 + ... + 111227.

It is an arithmetic number, because the mean of its divisors is an integer number (32408012).

Almost surely, 2^491145818 is an apocalyptic number.

491145818 is a deficient number, since it is larger than the sum of its proper divisors (286646470).

491145818 is a wasteful number, since it uses less digits than its factorization.

491145818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658 (or 4635 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 491145818 is about 22161.8098990132. The cubic root of 491145818 is about 788.9875498889.

The spelling of 491145818 in words is "four hundred ninety-one million, one hundred forty-five thousand, eight hundred eighteen".