491145787 has 4 divisors (see below), whose sum is σ = 535795416. Its totient is φ = 446496160.

The previous prime is 491145773. The next prime is 491145833. The reversal of 491145787 is 787541194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 491145787 - 2²⁷ = 356928059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491140787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22324798 + ... + 22324819.

It is an arithmetic number, because the mean of its divisors is an integer number (133948854).

Almost surely, 2^491145787 is an apocalyptic number.

491145787 is a deficient number, since it is larger than the sum of its proper divisors (44649629).

491145787 is a wasteful number, since it uses less digits than its factorization.

491145787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44649628.

The product of its digits is 282240, while the sum is 46.

The square root of 491145787 is about 22161.8091996118. The cubic root of 491145787 is about 788.9875332892.

The spelling of 491145787 in words is "four hundred ninety-one million, one hundred forty-five thousand, seven hundred eighty-seven".