1987559841 has 4 divisors (see below), whose sum is σ = 2650079792. Its totient is φ = 1325039892.

The previous prime is 1987559773. The next prime is 1987559851. The reversal of 1987559841 is 1489557891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1489557891 = 3 ⋅496519297.

It is not a de Polignac number, because 1987559841 - 2¹⁰ = 1987558817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1987559851) 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 3 ways as a sum of consecutive naturals, for example, 331259971 + ... + 331259976.

It is an arithmetic number, because the mean of its divisors is an integer number (662519948).

Almost surely, 2^1987559841 is an apocalyptic number.

It is an amenable number.

1987559841 is a deficient number, since it is larger than the sum of its proper divisors (662519951).

1987559841 is an equidigital number, since it uses as much as digits as its factorization.

1987559841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662519950.

The product of its digits is 3628800, while the sum is 57.

The square root of 1987559841 is about 44582.0573885952. The cubic root of 1987559841 is about 1257.3033452277.

The spelling of 1987559841 in words is "one billion, nine hundred eighty-seven million, five hundred fifty-nine thousand, eight hundred forty-one".