491568129 has 16 divisors (see below), whose sum is σ = 784268800. Its totient is φ = 302503248.

The previous prime is 491568113. The next prime is 491568137. The reversal of 491568129 is 921865194.

It is not a de Polignac number, because 491568129 - 2⁴ = 491568113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491568109) 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 15 ways as a sum of consecutive naturals, for example, 699889 + ... + 700590.

It is an arithmetic number, because the mean of its divisors is an integer number (49016800).

Almost surely, 2^491568129 is an apocalyptic number.

It is an amenable number.

491568129 is a deficient number, since it is larger than the sum of its proper divisors (292700671).

491568129 is a wasteful number, since it uses less digits than its factorization.

491568129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400501 (or 1400495 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 491568129 is about 22171.3357513705. The cubic root of 491568129 is about 789.2136216952.

The spelling of 491568129 in words is "four hundred ninety-one million, five hundred sixty-eight thousand, one hundred twenty-nine".