1591287985 has 24 divisors (see below), whose sum is σ = 2237336640. Its totient is φ = 1083295584.

The previous prime is 1591287967. The next prime is 1591287991. The reversal of 1591287985 is 5897821951.

It is not a de Polignac number, because 1591287985 - 2⁷ = 1591287857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10692 + ... + 57418.

It is an arithmetic number, because the mean of its divisors is an integer number (93222360).

Almost surely, 2^1591287985 is an apocalyptic number.

It is an amenable number.

1591287985 is a deficient number, since it is larger than the sum of its proper divisors (646048655).

1591287985 is a wasteful number, since it uses less digits than its factorization.

1591287985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46885 (or 46878 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 55.

The square root of 1591287985 is about 39890.9511669000. The cubic root of 1591287985 is about 1167.4803900923.

The spelling of 1591287985 in words is "one billion, five hundred ninety-one million, two hundred eighty-seven thousand, nine hundred eighty-five".