487331991 has 8 divisors (see below), whose sum is σ = 721973360. Its totient is φ = 324887976.

The previous prime is 487331987. The next prime is 487332011. The reversal of 487331991 is 199133784.

It is not a de Polignac number, because 487331991 - 2² = 487331987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487331491) 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 7 ways as a sum of consecutive naturals, for example, 9024640 + ... + 9024693.

It is an arithmetic number, because the mean of its divisors is an integer number (90246670).

Almost surely, 2^487331991 is an apocalyptic number.

487331991 is a deficient number, since it is larger than the sum of its proper divisors (234641369).

487331991 is a wasteful number, since it uses less digits than its factorization.

487331991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18049342 (or 18049336 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 487331991 is about 22075.5971833153. The cubic root of 487331991 is about 786.9400354827.

It can be divided in two parts, 4873 and 31991, that added together give a square (36864 = 192²).

The spelling of 487331991 in words is "four hundred eighty-seven million, three hundred thirty-one thousand, nine hundred ninety-one".