1987105161859 has 2 divisors, whose sum is σ = 1987105161860. Its totient is φ = 1987105161858.

The previous prime is 1987105161761. The next prime is 1987105161887. The reversal of 1987105161859 is 9581615017891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1987105161859 - 2¹⁷ = 1987105030787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987105161797 and 1987105161806.

It is not a weakly prime, because it can be changed into another prime (1987105161359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993552580929 + 993552580930.

It is an arithmetic number, because the mean of its divisors is an integer number (993552580930).

Almost surely, 2^{1987105161859} is an apocalyptic number.

1987105161859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987105161859 is an equidigital number, since it uses as much as digits as its factorization.

1987105161859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 61.

The spelling of 1987105161859 in words is "one trillion, nine hundred eighty-seven billion, one hundred five million, one hundred sixty-one thousand, eight hundred fifty-nine".