491431801 has 16 divisors (see below), whose sum is σ = 603559296. Its totient is φ = 390525696.

The previous prime is 491431793. The next prime is 491431807. The reversal of 491431801 is 108134194.

It is a cyclic number.

It is not a de Polignac number, because 491431801 - 2³ = 491431793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491431807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22846 + ... + 38791.

It is an arithmetic number, because the mean of its divisors is an integer number (37722456).

Almost surely, 2^491431801 is an apocalyptic number.

It is an amenable number.

491431801 is a deficient number, since it is larger than the sum of its proper divisors (112127495).

491431801 is a wasteful number, since it uses less digits than its factorization.

491431801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61728.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 491431801 is about 22168.2611180940. The cubic root of 491431801 is about 789.1406566567.

Adding to 491431801 its reverse (108134194), we get a palindrome (599565995).

The spelling of 491431801 in words is "four hundred ninety-one million, four hundred thirty-one thousand, eight hundred one".