1987582791 has 16 divisors (see below), whose sum is σ = 2673451008. Its totient is φ = 1313426400.

The previous prime is 1987582783. The next prime is 1987582801. The reversal of 1987582791 is 1972857891.

It is not a de Polignac number, because 1987582791 - 2³ = 1987582783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987582771) 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, 198106 + ... + 207896.

It is an arithmetic number, because the mean of its divisors is an integer number (167090688).

Almost surely, 2^1987582791 is an apocalyptic number.

1987582791 is a deficient number, since it is larger than the sum of its proper divisors (685868217).

1987582791 is a wasteful number, since it uses less digits than its factorization.

1987582791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10382.

The product of its digits is 2540160, while the sum is 57.

The square root of 1987582791 is about 44582.3147783962. The cubic root of 1987582791 is about 1257.3081844951.

The spelling of 1987582791 in words is "one billion, nine hundred eighty-seven million, five hundred eighty-two thousand, seven hundred ninety-one".