491768907 has 16 divisors (see below), whose sum is σ = 749844480. Its totient is φ = 280829952.

The previous prime is 491768873. The next prime is 491768923. The reversal of 491768907 is 709867194.

It is not a de Polignac number, because 491768907 - 2¹⁵ = 491736139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491768907.

It is not an unprimeable number, because it can be changed into a prime (491767907) 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, 30283 + ... + 43595.

It is an arithmetic number, because the mean of its divisors is an integer number (46865280).

Almost surely, 2^491768907 is an apocalyptic number.

491768907 is a deficient number, since it is larger than the sum of its proper divisors (258075573).

491768907 is a wasteful number, since it uses less digits than its factorization.

491768907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15082.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 491768907 is about 22175.8631624566. The cubic root of 491768907 is about 789.3210568974.

The spelling of 491768907 in words is "four hundred ninety-one million, seven hundred sixty-eight thousand, nine hundred seven".