491004392587 has 16 divisors (see below), whose sum is σ = 513239553792. Its totient is φ = 468843772320.

The previous prime is 491004392561. The next prime is 491004392629. The reversal of 491004392587 is 785293400194.

It is a de Polignac number, because none of the positive numbers 2^k-491004392587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491004392387) 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, 46198168 + ... + 46208794.

It is an arithmetic number, because the mean of its divisors is an integer number (32077472112).

Almost surely, 2^491004392587 is an apocalyptic number.

491004392587 is a deficient number, since it is larger than the sum of its proper divisors (22235161205).

491004392587 is a wasteful number, since it uses less digits than its factorization.

491004392587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13938.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 491004392587 in words is "four hundred ninety-one billion, four million, three hundred ninety-two thousand, five hundred eighty-seven".