491228811 has 24 divisors (see below), whose sum is σ = 716046240. Its totient is φ = 324504576.

The previous prime is 491228797. The next prime is 491228813. The reversal of 491228811 is 118822194.

It is a happy number.

It is not a de Polignac number, because 491228811 - 2¹⁸ = 490966667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491228813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 675330 + ... + 676056.

It is an arithmetic number, because the mean of its divisors is an integer number (29835260).

Almost surely, 2^491228811 is an apocalyptic number.

491228811 is a deficient number, since it is larger than the sum of its proper divisors (224817429).

491228811 is a wasteful number, since it uses less digits than its factorization.

491228811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1312 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 491228811 is about 22163.6822527305. The cubic root of 491228811 is about 789.0319879854.

The spelling of 491228811 in words is "four hundred ninety-one million, two hundred twenty-eight thousand, eight hundred eleven".