491100801 has 4 divisors (see below), whose sum is σ = 654801072. Its totient is φ = 327400532.

The previous prime is 491100793. The next prime is 491100817. The reversal of 491100801 is 108001194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491100801 - 2³ = 491100793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491100851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81850131 + ... + 81850136.

It is an arithmetic number, because the mean of its divisors is an integer number (163700268).

Almost surely, 2^491100801 is an apocalyptic number.

It is an amenable number.

491100801 is a deficient number, since it is larger than the sum of its proper divisors (163700271).

491100801 is a wasteful number, since it uses less digits than its factorization.

491100801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163700270.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 491100801 is about 22160.7942321569. The cubic root of 491100801 is about 788.9634437162.

Adding to 491100801 its reverse (108001194), we get a palindrome (599101995).

The spelling of 491100801 in words is "four hundred ninety-one million, one hundred thousand, eight hundred one".